I used to use Maxima Ultragreen until I was turned on to Suffix. I found that it has the same beaking/knot/abrasion strength as the ultragreen but a little more forgiving on spinning reels, plus it comes in a yellow color that I like for side drifting.
I'm curious what others are using and whether you're using it on spinning or casting reels. I'm using #10 test most of the time. (I'm talking mainline here, as opposed to leaders, where I still use #8 ultragreen).