There are Pro's and Con's to both methods, however with a probable size limitation in the secondary I think the shuffle and jam is the better. Most of the receivers that beat us on those throws are taller than our DBs.
I find it interesting that Saban doesn't really teach his DB's to backpedal. Rather, he teaches a "shuffle" technique. It's much more difficult to react to shorter routes if you're backpedaling.
http://smartfootball.com/tag/defensive-back#sthash.DoyrMu9j.dpbs
This is why a lot of Saban's defensive backs seem to take longer adjusting once they get to the NFL. It's then that they must learn to backpedal. You can't stay in press technique consistently in the NFL against beasts like Dez Bryant or Calvin Johnson. If you miss the jam at the LOS, it's over. Espcially with the caliber of quarterbacks throwing the football.