I agree, if you're looking for a boot to ride in, the thinner the soles are (generally speaking), the better. Those Justin's that you posted, OP, I would never want to ride in them because with those thick soles, it's just asking to get hung up.
Another thing to consider is the shape of your feet. If you have longer, narrower feet, then you'd likely get along better with a round toe. Because I have relatively short and very wide feet, I never did find a round toe boot that fit me well. When I was younger and my folks were buying all my boots, I used to get justin ropers. They were okay but didn't last very long as a working boot. I had to get a new pair at least every year because they would start to crack or the soles would start to come apart or the heel would fall off. Plus, I had to get them in a EE width just to keep them from pinching my feet and they still weren't comfortable.
Then, about 8 or 9 years ago, I got my first pair of Ariats. I could tell from the moment that I put them on that they would be much more comfortable than the Justins even though they still didn't fit very well because I went with a round toe. Professional Heritage Stockman - Ariat
Then, about 3 years ago, I got a new pair of these. Professional Quickdraw 11" - Ariat
They fit my wide foot well, they are super comfortable, and have been very durable. They've been slogged through mud and muck and poop and I can still clean them up and wear them out to town. Plus, they won't hang up in a stirrup any worse than any other boot designed for riding in spite of the rubberized sole. It will slip out of the stirrup like it should but won't slip around on grass when you're trying to walk LOL.