I am getting my HVAC system in my house replaced. I'm doing a Trane 2 stage heat and 2 stage AC. My HVAC guy, who I have been using for years, explained that the Trane Tstat is more intelligent than the Honeywell, Lutron, or Radio Tstat. He said I will get better efficiency by utilizing the Trane Comfort home system which is in my furnace and AC? Is this true? Trying to figure out if I should go with the Trane, Lutron or Radio Tstat.

Have him explain "better efficiency."

Since you're posting in a remote control site, I assume you're interested in remotely controlling the TStat. Yes?

Compare the capabilities of remote adjustments between the Trane TStat and others.

Incidentally, I've found A/C to be more comfortable if the fan runs all the time. When the unit is not cooling, there's still a slight breeze. A slight breeze at 78 degrees is more comfortable to me than cooling to 75 degrees and then sitting in non-moving air until the thermostat kicks the A/C back on at 80 degrees. I wonder which method uses less energy, though.

So the guy installing a Trane system is recommending a Trane stat......hmmmmmm, not too shocking.

Im with Ernie, I hate stagnant air.

I just researched that because this shithole I am temporaily living in gets so damn hot up stairs but the downstairs stays cool, because that is where the TStat and the intake is.

It uses more energy (don't care) to leave the fan on and the other aspect is when the fan turns off it allows the condensation on the coil to drip off and drain. When you leave the fan on it can reintroduce the moisture into the home(again don't care). Keeping the fan running helps balance out the temp between floors.

My home in KY had two separate units, one for the upstairs and one for the down stairs. It was amazing.

I'm really not looking to create an argument here, even though it seems so to me as I write this!

See, if you run the fan, then of course you're going to use more energy because you'll be equalizing the temperature upstairs and downstairs. That is, you'll be conditioning two zones instead of one. So, yeah, that takes more energy.

The thing I was wondering about won't happen with you. I was talking about, for instance, a single floor with well-thought out supplies and returns. Does it cost more to keep a person feeling cool by cooling the air more but letting the fan shut off between cooling periods, or by letting the temperature be slightly higher but keeping the fan on so a slight breeze is always felt by the occupant?

It's nice know that when the fan shuts off, moisture doesn't go back into the system. That's a surprise!

Moisture runoff, or not, depends on the air temperature, humidity, and the refrigeration cycle time.

Some HVAC use proprietary communication between unit and GUI (t-stat); not sure if Trane is one of them.
In those cases you have to use their T-Stat because it uses variable speeds, humidity sensors, etc.

Man my a/c is on 66 as we speak. Lol. 78 would feel like death

I always run my HVAC constantly. I use the 3M filtrete 2400 air filters and that cleans the air moving thru the house (air purifier). Makes a noticeable difference. The little bit of extra electricity the fan motor costs to run in between the cooling & heating cycles is well worth it.
In spring & fall, we will have the fan run only at night (7:00pm - 7:00am).

Water dripping from the evaporator coils, only when fan off? I absolutely call BS. The moisture builds up as the air moves thru. But when it forms large enough drops, gravity takes it down the evaporator coils to the bottom, where it drops into the catch pan.
Now when the fan kicks off, you can see a little surge of water come out the down pipe outside, from the HVAC. The air moving thru the box does create pressure that will keep some of the water suspended. But as it builds up, it will over come this and flow away - the steady drip you see when the system is running.

I once had a HVAC guy tell me NOT to run those 3M filters. That it would damage the system. Now a high static load on a fan that can't handle it, would bog the fan down and eventually cause it to burn up - true. But I told him if we have that cheap of fan on our system, it's getting ripped out right now and a better one is getting put in. After explaining it to him, him arguing, and then asking him to explain static load of fans or shut up, he was quiet.
By the way, I have never seen a blower fan burn out in any of the places I have lived... ever (always have used high density air filters).

System has a variable speed blower motor, and an outdoor temperature switch in the ac unit.

You might be 'stuck' with Trane T-Stat.
Remember that regular or 3rd party T-Stats are just a relay switches; separate relay for Heat/Cool/Fan and that's it. No modulation, no variables (pun intended).
On the variable speed blowers, the T-Stat acts more like GUI and sensor point, with digital communication bus on the T-Stat wire.

There are 3rd party companies that make controller/interfaces for the digital type A/C systems, but they're expensive.

I also posted over at HVAC talk, and it was confirmed that Trane Tstats communicate with the frunace and AC units to determine fan speed, when 2nd stage kicks on, temp thresholds for 2nd stage etc. I can get the communication with the Honeywell TS8000 or Lutron Radio Ra 2 derivative. Since I have Ra Classic, I think I may just go with the Honeywell or the Trane. At least with the Honeywell I can have my control system issue commands, which I never do with my current one that has the capability. IDK, maybe I will just do the Trane.

He may very well be right. About a year ago I worked on a project that was supposed to integrate the hvac. No one from our end ever talked to the mechanical contractor though, and just assumed you could swap out any t-stat. New high efficiency systems monitor inside and outside humidity along with outside temp. And the air handler adjusts air taken in from outside based on these other numbers. Some other things are going on too, but I don't remember all the details.

But I did find at cedia that Aprilaire's new t-stats are supposed to be compatible with these new systems.

Your tsat is set at 66? Does it ever shut off? Outside temp must be what, 70 maybe? That setting wont cut it here in FL.

Exactly what I was told. The Lutron Radio Ra Tstat, and Honeywell TS8000 will work with these new types of systems.