I've used both the otterbox version and tridentcase version.
The otterbox seems to have a better look and feel/design but i've gone through two of them. Once, when I dropped it in my room the case protected my phone but the snap-on teeth for the case broke easily. Next I tried taking the case off to get to my battery and it was hell... I ended up taking the case off but not without the same thing happening, one of the snap-on teeth broke off so neither of them would stay put on my phone afterward.
The trident case seems simpler and less aesthetically pleasing (although it has nice color choices) and slightly bulkier but it isn't a pain in the ass to remove at the expense of potentially ruining one of the snap-on teeth, and provides just as much protection. I can take off both portions of the case easy while I had hell trying to get the otterbox cases off. It protects the phone just as well as the otterbox, and it has open access to the shoulder triggers if that matters to you.
Go with the tridentcase > otterbox. My honest opinion after experience using both.