This is a really tough one as both of these guys are essential in an Angel deck and easily splashed into just about any other deck. TSA has the advantage of being able to take the NT-only LS, but with everyone playing NT heroes these days, that LS is seeing a lot less play anyway.
I just like Captain more as there are so many ways to band to him (thus all the "captain bands" that everyone uses). And since there is some decent evil CBN banding these days you might as well be able to band as well (which you can't with TSA ... sans Gathering).