The first is faster, of course. Whether or not I want the second depends entirely on what I'm doing :) It certainly shouldn't be the default - it isn't very useful during normal work - but I've been glad to have it before.

I wouldn't recommend -Bsymbolic by default unless you know it's safe for your environment, though. There is software that uses symbol interposition to 'productive' ends in production (not much of it, thank heavens). Mobile platforms are something of a special case.