Spinos are not only my favorite dinosaur irl, but they are my favorite mount in the game. They are agile for their size, deal tons of damage (especially when bipedal), and are so fast. If your Spino just stand in a puddle of water, it will get the hydration buff, which increases its damage by 15 percent, movement speed by 20 percent, and health regeneration by 25 percent. In the wild, they are extremely dangerous, aggroing on almost everything. However, when low on health, they will run away from a fight as a last-ditch effort to survive. Overall, even though there are faster creatures (Direwolf), creatures with more health or damage (Rex or Giga) and better creatures for diving the ocean depths (Tuso), they are the most well rounded creature to have - especially when mutated. My mutated Spino only has one useful mutation, a health mutation, but I pumped his damage so high, he is dealing over 1500 damage. I highly recommend the Spino to every survivor. It is so worth it.
To be strictly honest the spinosaur is one of the best mounts in game if you are even wble to obtain one be sure to make it a high level one they are very squishy at first so go around killing small dinos before attacking big prey
TLC patch coming in March 2018 to add the ability to swap between 2 legged mode (faster attacks and ability to attack with claws) and 4 legged mode (Faster movement), as well as increased turning radius, movement speed, damage, and health regen while in water and for a short time after leaving it. Like so people can see!