This is a more updated poll of this one ----> https://www.wilderssecurity.com/threads/favourite-web-browser-of-2015.372361/ Plus, as requested by @SweX... and @wildman...
Currently on my in list are Firefox, Opera 12.18, Seamonkey, Chrome and Chromium. Out is Opera blink since version 32 when they took away the flags for disabling sync. Vivaldi is still in the testing state for me and I don't use it regularly but I do install the latest build every few weeks to see how it has come along. I voted for Seamonkey because I'm happy with some of the small improvements it's made recently but I really don't just use one browser or have a true favorite.
I voted for other because I don't have a favorite right now. For a couple years it was Maxthon. Due to too many quirks, I switched to Opera about 6 months ago or so. I'm kind of done with Opera now and am looking for a browser that I can share between windows and android (can sync between both). I haven't found one of those yet that I like. So, for now, I'm primarily using portable Chrome.