It would be rather silly to actually vote in this poll.
First of all, as already pointed out, why bother to run such a poll on a site devoted almost entirely to D20? I could see it over at RPGNet or something like that, a site that does nto automatically favour a particular system, but at this site the results are a boring forgone conclusion. It's like taking a poll about political preferences at a single-party site.
Secondly, the best rules are the rules that fit the game, the group, the setting, and the feel wanted. As this is an "open" poll, there is no way to judge. This is like asking "Which computer program is best?"
I have preferences for many systems under different circumstances; D20 is good primarily due to the fact it is easy to get groups together, although it is not not my favourite set of mechanics; Over the Edge is wonderfully rules-light and flexible, but doesn't work well when the skill packages of the major characters are similar; GURPS has lots of supplements for lots of settings, though is rather mechanical for my tastes; Ars Magica is my favourite setting and has great rules to fit that setting, but has a hard time moving outside of that era and setting, BRP (RuneQuest, Call of Cthulhu) is simple, easy to learn and quick, but gets stuck on skills -- how many is too many?
So I vote "Other" and leave it at that.