Just plain Chrome here (Windows 10), as mentioned earlier it has simple sync and good password manager extensions. Also since i'm a webdev: i like the build-in webdesign tools (for example to show mobile viewport) and built-in lighthouse performance tests.
I'm currently using Vivaldi, and i just love the efforts towards further privacy, the bookmarks with the option to add an image or gif, and the built-in choice of using duckduckgo (which is a bit more of a nuisance to set up in other browsers)
Even though it's super resource-intensive, I use Chrome. I've gotten used to it and I really enjoy it but I think in the future I'll make the switch to Firefox. Chrome is great and all, but Firefox is definitely superior (even though I use Chrome more).
I use Chrome. Its as simple and clean looking as I want it to be. At the same time I also have a lot of extensions added that I really find help me out for my specific needs. In my opinion Chrome and Firefox are the best. I find Chrome is a little faster for me than Firefox. Just my opinion.