I found that "CM Browser" is better then both.
+1
Also, the "Night Mode" is easily accessible, it naturally blocks more Ads than Chrome, and it is very secure. Another big plus is "Night Mode" inverts screen colors, not just dimming your screen. You get white text on a black background, yet your pictures and images retain their "normal" colors. I was looking for that, since it's no longer an option on the stock browser (it was an option on the stock HTC browser I had on my HTC One M7).
I tried Dolphin, but you had to download an additional theme for Night Mode (important for me, if you can't tell) and then it just changed my default search engine. I hate spamware.
Firefox has desktop syncing, Reader mode didn't match up with the Web page I would change to. For example, if I was reading a 2 page article and switched to Reader mode on page 1, I would have to switch back to "regular" (i.e., super bright white background) and select the link to switch to page 2. Then I would have to switch to Reader mode again. Then, if I happened to switch to my homescreen, and pressed the Firefox icon/app, it would still be in Reader mode but on page 1. This was repeated, reproducible behavior. Very annoying.
I liked UC Browser, but it seemed to be limited to 10 tabs, for some reason.
Both CM Browser and UC Browser were extremely quick and "light".