Both are fantastic

Rey, because Luke didn't need to cameo in BoBF

I feel like a lot of people are going to vote based on preferring Luke over Rey

I always enjoy scenes with Luke before the sequel trilogy. I could honestly care less about that Rey scene

I did enjoy seeing Rey training herself

But Luke training himself was cool too

So I have to go with both

Luke had to train for three films, lost a hand before he "got good" Rey spent about ten minutes of screen time swinging a light saber at a rock and is considered a powerful Jedi. If they had done with Rey what they did with Luke, Rey would be a much more likeable character.