My opinion on the ones I know well
Ridley Scott:
Legend - DC is WAAAY better. Threatical cut was corny nonsense
Blade Runer - I never seen the TC.

Gladiator - Eh, about the same
Kingdom of Heaven - I don't think anything needs to be said.
LOTR:
FOTR - I like the EE more
TTT - I honestly don't feel strong either way for this one
ROTK - EE easily, if just for Christopher Lee
Brazil - By far the DC is the way to go
Apocalypse Now - I like the DC but I understand the problems with it over the theatrical
Star Wars:
ANH - Threatical cut, the DVD/SE cut has too much cgi nonsense on tatooine
ESB - DVD cut, just because Ian Mcdiarmid replacing monkey lady palpatine is worth it
ROTJ - Tough one, cgi nonsense in Jabba's palace but the ending montage is SO much better. Eh a tie