jin vs zader

Depends they both can be used in both raids. I don't have Zader but at level 81 I use Jyn with Rex and TFP I can solo P1 and 2 if luck is really with me. Once I gear Teebo I suspect I should be able to solo the raid then use them for P3 with Chaze essentially the same team.

I'd take a look at your goals and best raid teams for both raids with your roster to see which teams you can build the quickest.