Maybe faster in a straight out running race, but what about with a ball at his feet?
I don't know. I guess it goes back to what Mikey mentioned as well.
I still feel like Clyne manages to get forward and put himself in (and also create) plenty of dangerous situations. And I have pretty good confidence in Cork. So if Clyne wants to dump the ball off and use his speed to run into open space instead of trying to create space with his speed on his own, I'm good with it. Nothing wrong with a nice overlapping run.
Shaw being younger probably has the higher ceiling and perhaps can be a little more multi-dimensional. OTOH maybe Shaw could do with taking a page from Clyne's book and let the midfielders do the work.
As long as both fullbacks are able to cover their defensive territory and provide support on the wings, it doesn't really matter how they get it done. And I'm pretty happy with both those guys as far as that goes. Shaw seems to me like he is the superior crosser, but Clyne and Lambert/Puncheon have proven capable of some clever short passing so that works as well. I think both Clyne and Shaw have a tendency to get caught out, but that's the trade-off you make with Saints' style of play, and I also think both can and will improve as they get more Premier League experience.
In another two years, they both could be in England's back four and if they have or are capable of playing slightly contrasting styles that would serve both Saints and England well.