As we know most of these whiteboards have interesting hardware but terrible software. I was very impressed by a demo of the Google Jamboard. Really the first one that seems like people will use it. A little pricey. You can download the jamboard app for your tablet to get an idea of the interface (and people can use their tablets or phones to participate in the meeting).
[Link: gsuite.google.com]

I also notice that Samsung have a new product called Flip but I have not used one.