If you can get a deal on a Yellow Top, more power to ya. However, keep in mind that if anything goes wrong and you need a replacement from a small town parts store, you'll likely be buying a whole new battery from them if they don't have a YT in stock; that was my biggest deciding factor.
I have heard good things about the Sears batteries as well but I believe they are still lead-acid batteries, not AGM. AGM's tend to have all the good features of L-A batteries, but are much more durable. Although, again, you're not quite as hard on your rig as I am nor is it on the trail quite as often (unfortunately). AGM's and Gel-Cells have no spillable liquids to speak of therefore are not affected by rollovers or even punctures. Yes, you can poke a hole completely through an AGM battery and it'll still work (from all I've read anyway; I hope to never find that out first hand).