Use this Dino first to get narco berries, to get narcotic, to make narco arrows, to tame a trike which will do a better job than the parasaur at getting narco berries, you should tame the parasaur first because unlike the trike, it will run away so you don't have to risk dying, and then later you can get a stego which will get more berries than a trike, but they are kinda sluggish so upgrade their speed or get an argi to carry the berries back to your base.
Why does no one like the parasaur compared to other gatherers? Yeah, the others might get bigger amounts of berries but even if it takes longer it has much better movement speed than for example a stego, and not only that the parasaur has decent weight that will hold much more berries, yeah, I get pumping weight on other creatures but starting off with half-decent weight is good on its own. But conversation aside, Cooked meat is better to eat anyways.
In my opinion the best starter dinosaur you can get.
Decent movement speed with good stamina, an overall okay berry farmer with good weight and highly mobile. And this dinosaur has got very low saddle requierments and you can also shoot from it‘s back.