The technique you described in the first reply was the gladstone. There are a lot of different grips, I'l explain three, one is the French, then German and then American. Now don't get mad if I'm wrong on this little part ok? The french grip is where your thumbs are up and your palms are pointing at each other, I'm pretty sure that this is the fastest way to play (at least out of these three grips, but it depends on what you practice) because your fingers are on the bottom so you can use them more effectively for faster playing. Then theres German grip, opposite of the French grip, thumbs to the side, palms down. I think that thsi is more of a wrist grip (but then again I'm not the expert). Then the American grip is in between both, there is no right or wrong grips, it's whatever is most comfortable or fastest or just whichever one you like best.

The reason that the druimmer that plays palms down with the Gladstone method (I think thats what you said), is because the Gladstone is more of a wrist technique, well at least when you are going slower or up until you can't go any faster it's a wrist technique, then I think it switches to fingers.

I didn't know that I could write that much on something I don't really know much about.