There's also the fact that Bones has become pretty much a comedy at core. «A romantic comedy where people solve murders», that's how Hart Hanson described it in my local newspaper.
There are some similarities (he likes to protect people, for one) but Booth is much more open than Angel. Having rewatched some ATS season 1, I'm amazed how much DB's energy is different on Bones. Might explain why a number of fans who never really fancied him in Angel suddenly «discovered» his hotness (I've seen that quite a few times). Yay for epiphanies...
Virginie