When you say "saver", I suspect you mean "safer". My thoughts on the matter are that it is safe either way. Which makes you feel good? Definately swallow. There's something about your cum being spat out of the sidewalk/kerb that doesn't make you feel good. I certainyl don't hold it against a lady fro doing so because I haven;t tried it myself (being a fella and all) and I couldn;t honestly say that swallowing is all that appealing for me personnally, but if someone else is doing it to me - fuck it's great. Makes you feel fantastic and if the lady actually likes it, even better. Hard to find that though as not an awful lot of ladies like to swallow so it's kind of rare (or at least what I've found).
What I'd love to try is cumming whilst ramming my cock to the back of a ladies throat. Sounds rough I know but it's a very sexual thing and I must admit it makes me hard like a walnut.