A good mule is prolly best and I'm a horse guy. Saddlesore is right that it takes different handling w/ a mule. Only problem for me is I just know horses? I spent 6 days in the bob Marshall in June and my walkin horses did all I'll ever need them to do. My friend that I went in with grew up with the Cheff family that have outfitted in the bob for ever. They pack mules cause they are tougher. I plan on going every year from now on but once a year trips don't call for revamping my stock. I packed a 3 yr old walker and can't help but think if he did it at 3 he do just as good next yr? If u know mules great but if not it seams easier to get a good horse than good mule.