which SWG are you talking about pre/post CU? new experience (or was it enhanced)?
there have been so many changes in its foundation that you cannot ask the question like this; it's too inaccurate
nothing beats the old, pre-cu, pre holocron era. best mummorpegar ever (yeah i know that's debatable (i look at you, ultima online), but is was one of few big mmorpgs that actually had - and focused on - the RPG) but i still liked for not being everquest or WoW - back then. then they thought that they'd get more players if they turn it into just another mmo, with all the grinding, raiding, and the other stuff one usually gets tired of, sooner or later (if oyu're not one of these people, you'll probably not be reading this but raiding to get the newest equip boss X of instance Y drops with Z chance because the new armour has more of [favourite stat here])
i liked it when there were about a handfull of Jedi on each server and no-one new how to become one. i liked it when it had the HAM system. i liked it when TK Fencer was not the standard, and people watched the lowest dancers in the cantina so they could gain some dancing xp. and i liked it when every profession was its own, not part of one big "ranged" or "melee" profession. and it was ridiculous that people could solo nightsister elders and krayts - when you used to raid them with 3 dozens of well equipped characters, and still had a shitload of fun when the sister whupped all your asses, and speederbikes ^^
EDIT: i have to release my forum n00b: FIRST!