Felucca — because this was the original idea for the game. It held so many possibilities for the MMO genre on what you can do with human interactions online. I did not partake in the PK'ing, I usually tried to defense helpless miners around Minoc, but it just made the game feel so alive (even though it could be frustrating).
Felucca is the original game, the UO I grew to fall in love with even if it was harsh sometimes.
If this is a tricky question to tease or ask people which facet they like in the context of adding it to the NL, then I will choose - Malas.
If the question is purely personal preference then - Tokuno.
Felucca, I'm allergic to the other ones.
Trammel. The game was cruising toward being put into an early grave by EverQuest until Tram came along. It was so popular that people abandoned Felucca en masse and never came back, and every facet ever added afterward copied its rules because the developers knew they'd be empty otherwise.
$$$$$$ for another week
wanna know what the favourite hues are next week ?
depends on which character I'm playing...
my fisher = SOS = Trammel
treasure hunter = tmaps = Malas
my main character = questing = Eodon
pirating = Tokuno