erm... why does there have to be a "best"?
Just like every other gTLD and ccTLD each one has it's pros and cons.
You could like .tv because it can mean TV, .cc for credit card, .ws for website, .nu for "now" (in Swedish), .fm for radio, and so on.
IMO there is no "best", they're all pretty much equal, it all comes down to what you do with it, and how you package it and sell it.