I would be extremely happy with either, both in terms of landing one or two big recruits, who would lead to connections in SoCal and Florida.
W/ that said.. I prefer Luc, just based on his head hunting ability. However, I love the closing speed Shirley has getting to the ball.
I live in KC,Mo, close to Shawnee (Where McCay is from), Ive never seen him play live, but I do know that the competition he is facing there is no where near what he would be in Florida, Georgia, Cali, etc.... With that said, the competition isn't bad.
Rivals lists McCay at about 6'3, but in the newspapers back home it has him at 6'4-6'5. I think that alone, with a 4.5 forty is worthy of a spot on the team. Should develop into a mighty fine receiver, but I wouldn't say elite