If you pick a base character then the prime gets removed as well, the better version cant exist without the base version, however if you remove a prime version then the base character can still exist. My personal pick would be Valkyr due to how [IMO] useless she seems
What don’t you like about her? Raksh is a pretty good ability, and she works well with equilibrium. She’s not meta but I think there’s a lot of frames worse than her.