Board Thread:Morrowind/@comment-67.7.252.239-20140113011421/@comment-121.99.48.102-20140724024347

You can get a stronghold from all of them. Basically, it's Thieves should go Hlaalu, Mages Telvanni and Warriors should go for Redoran. Of course, if you're interested in the lore, there are many ideological differences between each which I would suggest you look into throughout the game. Personally, I chose Hlaalu because my character was a Thief and recognized that Morrowind would eventually be consumed by the Empire, it was better to work with them than against them.