Try to figure out your target audience first... 99.9% of the time that's yourself.
No UI is universally good because what is important to you is not important to someone else and what is unimportant to you is important to someone else. Here is a simple example. If you're a raider a raid frame is probably part of your UI. If you don't raid at all, would you want a UI with a raid frame?
"In anything, if you want to go from just a beginner to a pro, you need a montage." /w TankSpot WTB Montage for Raiders.