I use Chrome.
On my Macs, my PCs, my iPhone, my iPad. It syncs everything incredibly well, including bookmarks, tabs, passwords and more.
I liked Safari when it came out for PCs, but the syncing abilities of Firefox, and then Chrome, stopped me from using it.
I stopped using Firefox because of all the large, massive updates that seemed to slow it down more than help anything. Chrome updates itself frequently, but does so in the background, so I don't seem to notice it.
I also like the customizability of Firefox and Chrome. The add-ons/extensions help me do more with it. I realize that Safari is not as customizable for security reasons, but I'll sacrifice a little security for more oomph.
With Safari now syncing in iCloud, I may take another look at it, but with Google Chrome, it's so very nice that all my data is easily shared by one company across multiple platforms. Again, Safari could now give some of that with iCloud, but I may be too far gone into Chrome to turn back.
Walt D in LV