Was wondering if i should buy with or without screen. I feel like the screen is a little bit small on the + and are wondering if there are any fuction i will be missing if i buy without screen.
Will the crystalsky screen work with the regular pro controller ? I also wondering if the screen also can be used with the osmo ?

At the rate that some phones and tablets are becoming incompatible, I would think the in-built screen would be the best option. It is going to be much brighter and will have a bunch of new functions as time goes by. And no, it is not removeable as near as I can figure, so it won't be able to be used with the Osmo.