Macs in general, but specifically Safari SUCK at handling GIF files. If you visit sites that have many of them, you'll have a hell of a time trying to scroll. My 27 Quad i5 can't even render them decently.
I love Chrome for Windows but I find that I prefer Safari for the MBA 11. The speed incredible. I'm also annoyed at how Chrome auto-hides the address bar and tabs in full screen mode. Until that changes and gestures is added I'm sticking with Safari.
I tried Safari since its supposed to be integrated better with Lion, but I found it to be sluggish, especially using the new two-finger swipes. I was getting beach-balled far too much so I just went back to Chrome and three finger swipes.
Browsers are personal and seriously, "best with MBA" ? What type of question is that ? A browser is not better on some piece of hardware.
OS X's best browser right now seems to be Chrome. More up-to-date than Safari on Webkit, leaner, minimalistic GUI, the "task manager", integrated "Firebug" and other dev tools, plenty of extensions (Adblock, Flashblock). Firefox can't compete these days.
Just a heads-up from Google. They've already addressed the defective full screen icon on Canary. They simply removed it. You can still go full screen as you did in Leopard, but it won't be treated by Lion as a full screen app. There are no immediate plans to put out a version that supports full screen mode in Lion, but they are discussing how to best implement it. As for gestures, they recommend setting Lion to 3 finger swipes, which will also get you swipe gestures in iTunes and Finder.
Chrome is just so far ahead of Safari, there's no contest. Unified search/address box, cleaner and quicker to use layout, better extension and app support, google sync (rocks). Bookmarks are for people without integrated Google Instant.
While full screen safari might look flashy in Lion, it's a waste of space even on my 13" air. On my 27" iMac, it's almost comically oversized. I'll take http://manytricks.com/moom/ and Chrome over Lion iOS mode any day.
Coming from an ibook G4 running Panther, my experience is that Safari is horrible, iCab 3 is great and Firefox is generic. After getting a 2011 MBA, I still hate Safari - it won't stop accepting web cookies, even though I have it set to refuse them. Firefox is what I'm using now but, I may try Chrome or other alternatives if I find any. I can't really vote here, because it's not a poll about the people's least favorite browsers. I've always been most comfortable using a combination of browsers. Safari is the one which has been useless to me. I only used it to download Firefox with, so that I can use the web on my new MBA.
I'm a Chrome guy, but I did take some time to play around in Safari and test the new gestures. They are very cool and I can't wait for Google to bake them into Chrome. Apparently that is happening now, in case you're wondering: