I went with the OR because I wanted MTS. Was it worth the extra price? Probably not because I only go off roading about once a month; but I'd rather have peace of mind knowing I have more tools at my disposal than having to need to call a tow truck.
I'm also waiting for more options for stealth bumpers for a winch and I have a nice selection of recovery gear at my disposal. So to answer your question, they both are very similar--get what you feel comfortable spending, these trucks aren't cheap.
There are many things that I don't like about my TRD Sport, the lack of a limit slip differential and lack of auto 4wd. I had both of these on previous non-Toyota pickups and now I really miss them. Try pulling a boat on a slippery launch ramp with a TRD Sport and you will be sadly disappointed. I wish I had done more research, of course Toyota's website imply they have AWD and TRAC systems they are not the same. My advice do your research.