If you were allowed to use only one tracker...

demonoid

ooh what a question ?
it will be very hard to have only one tracker but in that case i will go with demonoid
cause it has everything in it maybe it won't be very fast but it has everything.

Demonoid would be my choice

RevTT.. TL has no pron.

ScT

Tl

Demonoid definitely

This is a horrible question, because the best speeds tend to be found on specialized trackers, and while demonoid might have all the content you want, its got shitty speeds and is full of mpaa/riaa.

ScT

TTi