from what ive seen.
same parts on a serval and a cheetah, the cheetah will make a good 10-15 hp on top, without porting.
90hp from a cheetah is like a walk in the park for it, 90hp from a serval your going to have to try a bit harder. 100hp from a cheetah your going to have to do a lil bit of work, a serval it will be a stretch.
the number 10 (as in 10hp) might not be a big number, but out of 100 (100hp) that is still 10% more. out of the box.
a cheetah can go were a serval cant and a serval will have better down low/mid than a cheetah. even tho the two basic setups make similar power, one can do what the other cant.
hence why there is two options
if that makes any sense.