Difficult to say, i'll just name my fav's and give a small explanation.
TNA - Good solid wrestling, i used to watch both TNA and WWE but i gave up on WWE cause i couldn't stand it anymore.
FMW - gone but damn i liked what i saw. (one day Hayabusa will fly again!)
Old ECW - I really liked the old ECW, or should i say "The Real ECW"
in a way TNA kinda reminds me of ECW fused with the good parts of WCW.
WCW - I might not have seen as much as you Americans but i enjoyed it, though i preferred the 93-98 WCW.
MLW - I liked it until they went from an ECW clone to a ROH clone.