If it were only that many times.  At least your asking what the best pools is instead of which pool makes you the most BTC with N hasrate.  But still it's a subjective personal choice most of the time.

But to attempt to be objective, not knowing what your goal or hashrate is, I would say BTC Guild.  That is the most reliable pool going that I know of.  Don't know much about Slush as I have never used it, except it is one of the first pools.

If you want to solo mine then I would say ck's solo pool.

Good Luck, and try to have fun.