She's not Supergirl level, but the character has kinda been multiple characters - different background, origin, codename and even name. While some of these can be blended to some degree, they also end up very different (obviously the dynamics of a relationship with 21st century Kate are very different to the dynamics of a relationship with 20th century Kathy, as they are very different character, the relative ages are different, etc.)
So, which relationships/relationship dynamics are most important to you. Either for Bette/Betty or the other party? Is it the mentor/student relationship for Kathy or Kate (if so, is it one more than the other?). If so, do you think it more important for the mentor or the student? The crush on or dating of Dick Grayson? Friendship with other Titans?
I can't really go for the mentor/student thing with Kate and Bette they way I could for Kathy and Betty. Not if they are the ages they are "supposed" to be. Supposed in quotes, because ages shift and continuity changes, but my head puts Kate debuting in her late 20s, when Dick is in his mid-to-late 20s and so I don't like the unequal dynamic. Could move Bette's age and not make her Dick's peer, as she's had little to do with him for decades, but I can't see Kate (at least from the time I read her, which has been a long time ago) having a child in the fray.
Bette really, to me, has been adrift ever since they brought her back in the 70s. She had only a few appearances to begin with, and seemingly had no connection to Dick afterwards (and comics had changed a lot). While they set up Titans West, it never happened. She had a mini with Gar, but since I never saw their relationship actually develop on-panel, it didn't do a lot for me. Since Bette isn't Betty, and the old dynamic with Kathy isn't a thing (so far as I know), she doesn't really feel connected to any other heroes to me. But, of course, she was never a solo title person with a civilian supporting cast of her own, either. So she doesn't really have other characters that I want to see her interact with or with whom her relationship is important with, at least to me.