I have had both. My only complaint with the 36 was its swell in the back strap. It felt way different than any glock I had and for this reason it was sold.
I describe the felt recoil as being slower and taking a longer period of time than the 27 offers.
I did not mind the recoil on the 36, I just noticed it more because I had several glocks and it was all by itself in that grip swell.
I still have the 27 around and it simply has a faster recoil impulse which many consider to be more recoil.
I still want a 36, but every time I pick one up and hold it that grip swell turns me off.
For rounds I ran everything from light and fast to big and slow, all factory loaded and boxed. No specific type of round was any more trouble than another.