For most people, all regionals are simply a means to an end. There are a few lifers, but the rest are just waiting for their interviews with the majors. I personally don't see myself jumping ship any time soon to go work for another regional. The grass may be a few shades greener, but you have to spend another 2+ months in training learning how to eat it, and I think seniority is worth more towards QOL than a shinier airplane.

It only took one time through training followed by the "you're going to be based as far from home as possible" phone call to make me not want to do either again. There's nothing like trying to find a place to live in a place you can't even visit before you have to move there next week.

I'd wait and get on with someone you think you can tolerate for a few years, and stick it out. It'll also make your future interviews go better. I don't imagine anyone wants to hire someone who has made lateral moves in the past - what says they won't do the same later? What if a better major calls you for an interview?