I've used both and never noticed a whole lot of difference, although I haven't paid much attention, either.
I've been using a set of surface-treat 135 degree split point screw machine length drills lately, and like them a lot. I've also got sets of bright 118 degree fractional, number, and letter drills, and they work well too.
I think the main thing is to get good-quality bits, whichever kind they are. Poor-quality drill bits are useless, and you'll have to end up buying good ones, anyway.
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Everybody is ignorant, only on different subjects. -- Will Rogers
Law of Logical Argument - Anything is possible if you don't know what you are talking about.