Let's compare them statistically. 2011 Revis vs. 2012 Sherman.
So Sherman played more snaps and received one more regular season target. Sherman also allowed four more receptions, 124 more yards, but only 18 more YAC and one more touchdown. Sherman also picked off four more passes. Sherman had a lower QB rating again, more cover snaps per target (more is better), more yards per cover snap (more is worse) and less cover snaps per reception (more is better).
(this includes playoff stats, so numbers will be bloated in favor of Revis)
Sherman allows more receptions per target, allows more yards per reception, and gave up a 56 yard pass vs. a 53 yard pass for Revis. Both had two receptions allowed over 50 yards. Sherman had one less pass defensed during the regular season.
Overall, it's almost exactly even, but Sherman is more of the ball hawk. The difference between those stats are minute other than the INTs and yards allowed. People dismiss interceptions, but Sherman had 2x the amount of interceptions with only one more target during the regular season.
By the eye test, I'd put Revis' prime (2009) over Sherman (2012), but I don't think we're talking about that, we're talking about now. Revis is coming off a torn ACL, and as easy as it was for Peterson, Welker, etc. to come back from that injury, it's still a concern. Going into next season, I'd probably rather have Sherman on the Seahawks than Revis on the Jets, but Sherman is helped out by the Seattle defense.
I'd say it's even.