Tennessee walkers can walk great and all, but if you want horses for rugged mountains, they are not my choice especially if you will be using them a lot. We had a few TW in our herd back when I was guiding, you couldn't use them more than a trip or two because no matter what they begin to lose weight and need to be rested. They were allowed to free graze 12 hours a night, so they had plenty of feed.
My personal preference is a big quarter horse 15.2-16 hands. Also quarter/draft cross as long as they don't have a barrel of a body that sticks your legs out like toothpicks. Having the draft in a mountain horse is nice because the temperment is usually relaxed when it comes to wrecks and grizzlies etc.
I have packed and rode hundreds of mules, and a good riding mule is top notch and smooth, but I just prefer riding horses and packing mules. Also if you are only getting a couple, mules stick with with a horse or two.. but all mules without horses, might leave you stranded someday, but then again so will a horse haha.
There really is no correct answer, it's personal preference and takes experience to know what you want. My personal "dream string" for myself would be 2 quarter/draft crosses to change out riding, and 2 good pack mules. That way I could always turn mules loose at night and just pack feed for the horses when hunting late season. That's my long 2 cents!
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