I've tried a few, but keep coming back to Chrome, much to my dismay. The lack of bookmark importing has been my biggest reason to stay with it. But as I like to say, each update is better than the next.
First they removed the useful bookmark and history buttons on the new tab page and replaced them with spam.
Then they got tired of virtually everyone bypassing their spam by removing the flags that allowed you to revert to the traditional layout.
Then they removed the ability to swipe in from the left to access bookmarks and especially the sub-folders, making you navigate bookmarks on a per folder basis. What used to take me only a few actions all close to each other, now takes up to 5 actions in various parts of the screen to get from one bookmark to the next I wish to view.
In the latest change (I refuse to call it an update, because it's yet another step backwards for me), they apparently moved the navigation bar to the bottom of the screen. I'm only going by the reviews, as I'm holding off updating as long as I can because this too I don't want. I didn't want those other updates either, but guess what comes with system updates: forced Chrome updates that you can't roll back!
Yeah, it's the king, but only because people are so integrated into it. It's like Apple with their integration that makes it hard to leave. It'll be a big hassle to migrate all of my bookmarks manually, but at the rate Google is going, it'll be worth it before long.