Which version to buy????

Hello, Im really considering buying touchable pro, but wanted people’s advice as to which one is most stable. Any version (windows, iOS, Android) is fine, because currently I have all of them. I think I’d like to run it on a separate machine from my PC that is running Ableton. I have a surface book 2, that will be running Ableton. I also have an iPad, a Samsung tablet, and a surface pro 6. Any of these can be used as the controller, but which one is the easiest to hook up, has the most current features, and is most stable?

Touchable 3 is great. But they have raised the price immensely to get people to buy pro. Pro is unusable as is unfortunately.