If you’re low level and want to grind for exp or tames I strongly recommend pachy because it’s easy to tame and dose torpor for taming and if you want to get exp just torpor it up and then finish it or with your weapon
The first time I heard one of these little critters, I thought, hey is that a goat?! Anyways, they are fun to have around and tamed, as they knock things out and run pretty fast while charging. However, they have considerably low health and stamina, so they can be quite troublesome when low lvl. But who cares, they make goat noises. If only they could eat anything
While not the best fighters pachy's make decent early travel mounts. Their base speed isn't all to high but using the alternative attack will cause the pachy to charge forwards are decent speeds and dealing a fair amount of torpor to what ever they hit. Pumping movement speed and stamina will have you moving around the map with ease.
Pachycephalosaurus are small, slow dinosaurs that at first glance may seem lacking in the use department. However leveling one of these Cretaceous critters, especially a high level one, in Melee, Stamina and Health can turn them into the ultimate living taming mount only rivaled by a high Melee Mantis equipped with clubs, knocking out Parasaurs, Trikes, Dilos, Raptors, Pteras and more in one or two charge attacks that can down creatures far more quickly and efficiently then the average Beelzebufo or Pulmonoscorpius. Not only that but there eggs can be used to make the preferred kibble of the Paraceratherium. Meaning taming Pachys for eggs is also quite worthwhile
Its charge attack is significantly faster than its sprint- I can easily leave my tamed carno in the dust with it.
Just keep in mind that you can't turn, and easily get hung up on even small rock-piles when charging.
A pack of 4 or more of these little guys can down a low- to mid- level carno without breaking a sweat, but they tend to get stuck on one another when used in packs. Best I've found is to make a follow train with each dino set to follow the one in front of it.