Writing Tenses

Just a quick question if I may.

What do people consider the best tense to write in? I tend to (try to) write in past tense, but I see a fair few great works that are written in present tense.

I've googled this and opinions seem to be divided on the issue of which is best.

I was curious what tense experienced (and not so experienced!) fanfiction writers prefer to write in and why - and did they switch around until they found the tense they preferred?