1000xp engine swap or sell 900 and buy 1000

kind of new to the threads but im having hard decision pay off 900 sell it and buy a 1000 or buy a 1000 engine and do the motor swap i have a 2014 orange madness edition so the swap should be fairley easy if i have read up enough on it how are the 1000s doing in the 900 frames are they much faster than the actual 1000s since they are lighter i mostly ride creeks around here and go to atv mud parks and race on some sand bars