RE: diference in performance on engines question please.
The simple rule is: Manufacturers claims are bu.lsh.t and a bigger engine will have more power and torque than the smaller (with a few exeptions)
You will never run any of those engines too the listed top practical rpm because then you had to use a toothpick of a prop and it wouldn`t fly your plane very well.
The ST .90 will have the most power for your Cessna