Zader vs. Zaul. Who is better and Why?

I did Zader instead of boba....so glad i did...aside from the perma-dots (reason i did it) i found the TM reduction aspect is super valuable in raid and even moreso in arena...when EP goes fast and sucks tm off everything AND stuns...well its like "in the bag baby" oh and then throw in a saber toss and execute for good measure AND with boba and zader and ep aoe's theres gonna be buffs/debuffs everywhere across screen ...floating acoss heads from one side all the way to other side of screen going directly up the opposite sides toons rear-end!

Question is do want kenobi? I as far as i know the zaul 1mill thing is not do-able on heroic tank raid so its not gonna fast-track kenobi if thats what you were thinking...