Pretty obvious, which team has the better tandem at running back?

Virginia Tech, with Ryan Williams (SO) and Darren Evans (SO)
or
Alabama, with Mark Ingram (JR) and Trent Richardson (SO)

Stats:

VT Duo: 2,920 rushing yards on 580 carries for 5.03 yards per carry.
Bama Duo: 3,137 yards on 558 carries for 5.62 YPC.