I have had them all, and all of my costumers have a set of Davallo.
The Easy Boot Trail is a good boot for a good price. But it’s not the best if the terrain is tough. And because the closing thing is on the backside it is a great risk your horse will open it, stepping on it with his hind feet (if it’s on the front feet). And often horses have a low heel in the hind feet, so that will put a lot of pressure on the boot in the bulb area. It also has a slow break-over, so you should not use this on a horse that is already breaking over to slow.
The Cavallo Sport is a great boot. A lot of my costumers have a pair of these and they love the light weight, the easy and quick apply. I love the combination of synthetic and leather, the synthetic keeps the weigh and price down, and the leather allows the boot too fit the hoof perfect if put in hot water before the first time you use them. This is a boot that will be perfect for hoofs with a long hoof base, since it is narrower than both the Easy Boot Trail and the Cavallo Simple. And with an early break-over point this will help a horse with a slow break-over to walk more correct. If the horse already has a early break-over, this is maybe not the best alternative.
The Cavallo Simple is the first boot I ever felt in love with! And 75% of my costumers have them, and love them. I still use the first pair I got 5-6 years ago, they don’t look that nice anymore, but they are still working as good as new, maybe even better now that they fit the horse perfect (both the inside and the outside of the sole). You can have almost any hoof shape and these will still fit and stay on, as long as you have the right size. I have never lost one, even when I have had to use too big ones, and my horse does not have a perfect hoof shape. The Simple boot does have a higher weight than the others, and some people feel they are too big and clumsy. This boot fits horses with a wider hoof than the Sport, but it can be used on a narrower hoof too, it will stay on. The break-over is normal on this boot, so it fits horses with a normal break-over and good break-over.
So what you should think of is the hoofs you are putting these on, not necessarily what you think is the best. Find out where your horse has its break-over (at all feet), is it perfect, too slow, or too early? Does he have a long and narrow hoof base? A round hoof base?