Swallowing is nice and certainly makes clean up easier, but since we men are such "visual" creatures, it can sometimes be more fun to put on a little show with it....drooling it out over his cock while finishing him off and just making a general mess of things is my favorite way to finish. You'll never hear me complaining of a good swallow, but sometimes the "artful finish" can be the sign of a true pro.
FYI, snowballing can be great fun between two dedicated snowballer fetishists.
One thing NOT to do is run off to spit with a mouthful when your man is in the afterglow of his orgasm. Just me.