What about the UI don't you like? I've heard this complaint before, but the two appear pretty similar to me, at least to the point that I never considered one more appealing than the other.

icons, text, bookmarks bar, all seem unpolished, to the point it prevents me from using it.

How can superficial details like that be more important to you than your privacy?

I just opened both browsers and it's pretty hard to really see much of difference in UI. If anything, Chrome's UI is slightly more basic. But the icons, positions of menus, etc are almost identical.