Equus are quite possibly the most underrated tame in the game. Their kick immediately does ~3x their attack damage in torpor, and the cooldown between kicks is almost nonexistent. One 2nd generation equus from a high level pair can KO almost any land KO tame in the game in under a minute, only excluding gigas and a few dinos like gallimimus whose torpor is unnaturally high compared to hp. You'll probably be looking at around 200-300 torpor per kick on a bred, unmutated horse, depending on levels. Imagine how high you could get it through mutations.

I use these to tame Rexes, Therizinosaurus, Yutyrannus, Griffins, etc. Never breaks a sweat. I recommend gate trapping dinos with knockback attacks, flight, and other abilities though. Trap yourself in with the dino so you can keep kicking without getting flung around. Once you get an equus, you'll never need to spend resources on tranqs again.

As a bonus, these guys are a lifesaver when it comes to getting KO'd dinos out of sticky situations. The lasso lets you drag KO'd dinos around, meaning you can stop that quetz from drowning, or pull the dino you just KO'd out of the hole in the mesh it fell in. Plus their saddle acts as a mortar and pestle if you forgot to bring narcotics along, and they can gather the narcoberries for you just fine.

Level health and attack. Have fun playing with Ark's best kept secret.