I don't think you will like the Keystone having had a Jayco; all I have looked at looked cheap in comparison to my JayFlight. Another thing is that the Keystone does not appear to have nightstands, which makes it a no-go in my opinion. I would try to the sofa/dinette in the OR and the sofa and dinette in the Jayco and see how they actually sit. I have the JayFlex sofa, like your old TT, and it does not sit good long term, like to watch TV or read. I would think the OR might have the best sitting for hanging inside when weather is bad.
By the way, you will love having the bathroom next to the master bedroom. It is sure nice to not have to worry about waking kids when you get up in the middle of the night. That was the most disliked thing about my previous TT -- having to go past any guest to get to the bathroom.