Redemption has better anti snub coverage, and is slightly better in the sense that is is more all-round better.
Fighting the valor head on is like fighting a sledgehammer on steroids. But once you get past/above/below it, it is relatively easy to steamroll it.
The Redemption, while suffering size vs power issues is more well balanced as an all-round ship. It is decently powerful in brawling, has good kiting capabilities with 2 dedicated heavy slots pointing backwards (sounds stupid, but dual mortar back there is simply brilliant), it is also better looking, not to mention, more often then not, heavily underestimated.