What motorcycle should i buy?

Im looking at motorcycles and im not sure whether i want a R1 or a R6 one of my friends said that i should forget about the yamahas and buy a CBR but im biased towards yamahas. im about 5'6" and about 120 lbs. ive grown up riding dirtbikes and fourwheeleers ive been riding fourwheelers more often because i own five of them(three blasters, a banshee, and a raptor 80) ive also been riding my buddy's YZ250 lately which ive gotten more used to cause i havent ridden dirtbikes in a while, im really just askin to see what you guys think, i still have another year til im gonna buy one so im lookin at the newer bike cause im gonna get a brand new one when i graduate so just let me know what you think and it will be appreciated