No dude, you don't understand.
Pep manages Barca youth team, they can more than properly asses his capability as an actual Manager (albeit youth coach)
Giggs has never given the chance to show his capabilites yet (coach =/= with manager)
If you think Barcelona appointing Pep means we can appoint Giggs and they'll both perform, you'll be at the end of the day basing it on perception without actual prove.
Why don't make either Butt, Beckham, Scholes, Phil Neville, or Gary as the manager, they are all are in the class of 92
EDIT : Take Keane for examples, he jump straight into managerial role, it doesn't work for him at the end of the day. Infact, I've been telling you that Pep is an anomaly, not the norm. Many of ex-united players jump straight to managerial, and none of them have performed well enough to even get a look at at the top club. The sample is quite against Pep, like I said, for every Pep, there's 10+ Keane.
If you're fine with us taking another gamble, then by all means Giggs is the one you oughta gamble on, he's earned it. But don't make it as black and white that he's the perfect candidate, he's far from it, far form qualified, just like Moyes.