Better on what?
Detection, performance, false positives, removal of malware..?
Better is very subjective..
Most important thing is detection of course. Avast is ofcourse best in perfomance. But I read in av comparatives that avast is bad in removal of malware (it miss some registry entries, and this stuff can stuck computer's registry - malware can be completely deleted by avast), false positives aren't so bad on avast.
But anytime (long time version 5.0.699) I just typed in google search "nobrain.dk" and It pop-ups that it blocked trojan horse (how?) i wasn't enter that site I just type nobrain.dk into google. Is this bug?
Not if you're using Google Chrome as your browser, since it's search bar is also the URL bar. Typing that domain would take you directly to the webpage, thus having avast alert on it.
If you weren't using chrome, then no, it shouldn't have alerted you because you didn't access the site. I've never seen it do that with any other site that hosts malware, so I don't know why that one would be any different.
By the way, warn someone before you post a site like that! I did it to test, and not only was that completely nasty, it's very not work appropriate.