I’ve used both Cavallos and Scoot Boots, and I like both. I ride on very rocky trails and gravel roads, and both brands last about 500 miles for me.
The Cavallos are easier to put on and take off, and it’s easy to get the right size if you measure correctly. The Cavallo Simple boots did not fit my horse very well, but the Cavallo Treks were perfect. Over several years I only lost one once when my horse got his foot wedged between two embedded rocks. He pulled his foot out of the boot, but there was no damage to either his hoof or the boot. I just put it back on and continued with my ride. Another advantage of Cavallos is that they can be used as a therapy boot. I once used one to keep bandaging in place while I was treating an abscess.
On the downside, Cavallos are hard to keep clean. The velcro fasteners wear out, but Cavallo includes a replacement set with the boots. Also, the top of the boot (where it touches the coronary band) can become cracked. I always had to put duct tape there to keep it from rubbing.
I like the open design of the Scoot Boots. The back fits around the heel bulbs, and the top fits below the coronary band, so the boots can’t rub if the fit is right. They’re also very easy to clean–just rinse them with water. And there’s no velcro to trap dirt and debris.
For me, the biggest disadvantage of Scoot Boots is that it can be hard to get the right size, even with good measurements. For this reason, I think it’s a good idea for first time users to try sizing shells or demo boots before buying. You can get demo boots or a sizing kit with boot shells at Try Scoot Boots (https://tryscootboots.com/ ). Other vendors may also offer a similar service.
Another disadvantage of Scoot Boots is that they are harder to put on than the Cavallos. I have to use a hoof pick with the Scoot Boots, and if I ever lost a boot on a ride it could be hard to put back on without a pick.
@fivestrideline, IIWM, I’d go with the Cavallos since you’re new to boots. They’re sturdy and easy to put on. They can be used with pads (although I’d try them without pads first), and they would be a good boot to have when you start more vigorous riding. Later on, when you’re more familiar with boots, you might want to try Scoot Boots or one of the other brands people have recommended.