Maybe this is just my personal opinion, but I think it should be neither; I think wikis should just be neutral in tone and deliver facts without bias. Sure, people are entitled to voice opinions, but I don't think wikis are the time/place for it. I've never seen a wiki more loaded with blatant bias overtones than TFwiki. I've also never seen a wiki loaded with more spelling and grammatical errors than Tardis wikia. Lemme put it this way, I find Wikipedia has better standards than TFwiki... and it's not as if Wikipedia has terribly high standards!
^Justmyopinion.