There are differences of course. But some similarities. Daniel is rich, but he inherited it. He has a crazy dysfunctional family with a crazy mother. While Betty is middle class with a functional family. He has some disdain for her at first, but grows to like and rely on her. Daniel is a lot nicer than Jack though. Daniel's mother thinks they should get together.
Mostly, it's the fan base which seemed to be split on the issue. Much like with Jack/Liz. The show had a tricky job in trying to make both camps happy.
I didn't watch the whole run. I didn't even watch all of the last ep, so I'm not sure of everything.
[sp]But Betty moves to London. She runs into Daniel while she's there. And he asks her out to dinner. It's left up in the air, anyone could've taken what they wanted from it. The shippers and non shippers.[/sp]
Hopefully, that made sense.