It just depends who you listen to. Luck is is bigger, and we have 6'7" linemen to the left. RG3 is 6'2" in heals. I love them both, but my fear is RG3 is one hit away from major injury....
Luck is the real deal here no facade or mirage. When replacing a living legend like #18, go with the Stanford University prospect that most closely mimics Peyton's on field mannerisms IMO.