Which character evolve? Magus Chopper or Assassin Trickster?

Well i have them both at 4* 80 now and just need to farm white 3* stones to evolve either, but which is better?
Both are unlikely to get in my PVP team (VHE, GCR, Claire and Magus UR), maybe replacing the clairvoyant.
Both Steal Effects, one with passive, one via power move, yet the trickster has the critical hit.

Has anyone who has one (or both) at higher levels any experience on who is better? Is either good for PVP, PVE or the dragon?
Talismans are already equipped (Chopper has endurance, holy and 1 optional, depending on final lifepoints - blue or yellow, trickster has void and counter set) and mostly 50, yet all able to max, shards to max 1 of both.