Which is the best XHTML validator ?

[veenuisthebest]

hii..

I wanted to know which free service/software should I use to check my code if its valid XHTML 1.0 Transitional. I tried the following free services:-

1. http://validator.w3.org/
2. http://www.validome.org
3. The HTML validator addon for Firefox

BUT I notice all three result in something different. For the same page, one is giving me few errors, one few warnings and one validates correctly.

So, which one should I trust more or should I make my code pass all 3 ?

Thank You