Re: WP or BB login?
I ended up having to support both, because I wanted users who sign in on a bbPress page to “stay” on the same page… and users who signed into a WordPress-powered page to also “stay” on the same page.
I used to only use the bbPress signin, which worked great… but then users who signed into WordPress pages got sent “back” to the frontpage of my blog, which annoyed my users.
Hope that helps!