I also use Safari on a daily basis, with Chrome when testing web apps.

- iClouds tab sync

- quite fast

- two-finger swipe for back/forward with nice "cover" effect

- scrolling is silky smooth*

- iCloud keychain*

* available on Mavericks. Scrolling was good enough earlier, but on Mavericks its butter smooth.

I just don't like Chrome, for one. But, I really like the scrolling, pinch to zoom, swipe to go backwards, bookmark syncing across my multiple computers, etc.

The inspector, as flawed as it is, has some nice features. I don't have Mavericks, but I believe these updates are coming: https://www.webkit.org/blog/2518/state-of-web-inspector/

I prefer Safari because it integrates into the Apple ecosystem, including e.g. iCloud tabs, Keychain integration, gesture support; because it's a native application; because it's perfectly performant; because it doesn't phone home. I don't write web applications or even use many, so my needs are well satisfied.

It blows the other browsers away in scrolling performance on a retina display laptop. Chrome has gotten a lot better recently, but it's still worse enough that it's worth putting up with Safari's weaknesses.

UI is just way better than anything else out there

UI feels and IS more native than anything else out there

Performance is better than Firefox and only worse than Chrome in beta technologies and a few edge cases