Neither of them intrigue me much, and something about both of them annoy me endlessly in one way or another; Carver having that giant stick up his rear, Bethany just being a predictable character. But if given the choice, I would always chose Carver. His character is very well thought out [IMO]. And while he may feel like a nuisance character who just complains, his relationship with Hawke is much more intense, and has a better impact. It's clear that almost no matter what, Hawke and Bethany always seem to get along fairly well with each other, but Hawke and Carver do not, and yet you still end up saving his life from Grace, and other blood mages in Act 3. That, and upon siding with the mages, he eventually helps you out in fighting Meredith, because despite whatever feelings he has toward you, you are still his family, and it is still his priority to stand by you. I wouldn't say he's necessarily a likable character, nor is he very bearable to listen to for any given amount of time, but his character just feels more emotionally connected to Hawke than Bethany [negative emotion, but emotion nonetheless.]. Both of them are still pretty one-dimensional though, IMO. Carver is always sad, and constantly complains about "living in your shadow" while he continues to do nothing about it, not even upon becoming a templar apparently. And Bethany is, as Varric nicknamed her, Ms. Sunshine. Everything is okay, and when she was taken to the circle, it was more of an "Aw man, there goes my strongest mage" moment instead of a "Don't take my VG sis away from me you jerks!" moment. Neither of them really grew on me, and I'd rather have Bethany in a party simply because she's easier to listen to, but as an actual supporting character, Carver takes the cake.