^Note you have 6 set of Squads, so IMO it's the best to put your best Knights in the first Team of Set 1 = Helper and use your other Set for fighting Raid Boss or for farming Campaign/Missions with different playstyles (example: Set 2 with 4 balanced Teams with similar Speed, Set 3 with a very fast and powerful first Team, Set 4 with a single low Level 2* Knight to poke a Seed Bearer, Set 5 with an unique Squad with a Total Power ~90.000 to poke strong Boss, etc).

I went with Cattleya because she was the only one of the 4 I didn't have lol. That makes Rainbow #17 for me (probably only 5 of them random draw, maybe 6 but I've bought gems in the past in addition to Gold deals). Haven't really looked at her because still in the process of leveling her.