The Spino has recently been super-buffed.
It now loses only 4 stamina a second instead of 5
Its damage has been increased from 550 to 860
It now does bleed (I don't know exactly how much yet).
It does seem to have a slightly slower bite, but this really doesn't compensate for everything else.
This pretty much points to the Spino now being the super predator of the island. Being able to easily face tank a Rex now, it seems to be the ultimate predator. The Rex does still have somewhat absurd healing and leg break though (to my knowledge), so the strategy would be to break a Spino's leg, and run away or slowly wear it down over time (as Rexes did before).
At least it's still the slowest apex.