There is no answer to this, given how subjective the question is. It's like asking "What's the best colour?"
Right now, I have (scurries off to check) 1512 active fonts installed on my system. I like some of 'em better than others, but they all have their uses and even the unattractive* ones will sometimes be exactly what a design calls for.
*Unattractive to me. There are objective metrics by which a font can be judged 'bad' (the terrible kerning in Comic Sans, to pick a famous example) but, beyond that, it's all a matter of personal taste.
