About a month ago I was finding that Pioneer Elite was much harder to obtain than Sony ES. But maybe things are different now. Regardless, I have tried both and they work essentially the same.
Certain Elite models won't show the "Works with Sonos" feature until you do a firmware update.
Doesn't matter if it's a Port or Connect. Works as expected. I actually think the Pioneers might be a little quicker to output audio than the Sonys.