Spino are a very deadly mount which they can switch between to mode: traveling mode(speed ++, attack speed - -)

And combat mode(attack speed ++,speed- -) and if they got hydration buff(active when you ride your spino and touch water) they will move even faster, attack much stronger but without hydration buff, they will move slower and deal less damage

Taming is difficult without a mount due to their speed when fleeing

I once tried to test my spino(lv 300+) and my rex(lv 400+) to see how much damage they deal, te result is

My spino deal 400+ damage per attack with hydration buff to non amored creature

My rex deal 700+ damage per attack to non amored creature

Because spino when in combat mode, it will attack twice as quick as rexes which made it better than rexes(ONLY WHEN HYDRATION BUFF IS ON)