I like the completions of Sublime text a lot better for most tasks. ST’s packages are also really powerful and BBEDit isn’t extensible in the same ways (though it is through AppleScript and a host of other things).
After the 30-day “trial” is up, the features in its free version are more than worth keeping it installed for. I keep an active license for it in addition to Sublime Text because it’s my preferred tool for complicated RegEx things and multi-file search.