The mt/r is 'maximum traction/reinforced' with Kevlar. Not a 'mud tire'.
No way in hell the trxus will last longer than kevlars, I have over 35k on mine now as I have been DD it again as my truck is down. We have had ice the last week and I have had nothing but maximum traction on ice.
Mine are currently sitting at 13/32's give or take what the rear Detroit chews.
But why not go with the trxus? You narrowed it down, It will suit you best, You only drive X amount of miles in it a year, how can you go wrong with a tire you piced and have done the homework?
Unless you think there is a better or don't want to run them for any reason, The Kevlar is the closest tire you will find. They just have a 'look' you don't like, That's cool, I didn't either until I tried them.
Whats the reason for not pulling the trigger on the trxus?