You can choose which result you like the best and use it.
UPDATE 2010-06-23: I’m in the habit of using the third option in the image below (YUI Compressor 2.4.2 with no options). When I first started working on SPServices and releasing it with a minified version, that one was the winner in terms of size. I also had some problems with a couple of the other choices, which I tracked down to some problems in my code as opposed to the minification method I was using. In any case, I think that smaller is indeed better. I’ve just decided to stick with the one method over time, figuring that it’s a known quantity.