i find it is alot faster to frame it on the floor but trying to put it exactly in place can be hell especially working alone. i find framing it in place is more accurate and you dont need an extra set of hands.
I have lifted 30' walls alone (no plywood) Take 2 2x4 (or2x6), every 16" nail on a 10" block of 2x4 with the bottom cut on a 45 degree angle, stand them up, space these 1/4 from each end of the wall, secure to the floor use a 2x4 on the floor braced back to opposite wall. then 'climb' the wall up them one end at a time.
Two of us regularly used this method with plywood on the walls and we lifted up to 36' of 2x6 wall 8' tall.