You are correct Andrew. The Cylinder, or Power Reel, as many here in the U.S. call it, is a bit more complicated to service. = Engine + chain drive system + 8,10 or 12 blades to sharpen.
The Rotary mower has just an engine and a blade.
You will get a cleaner,more precise cut with a cylinder mower. There is your trade off.
if I were paying for the services of a technician on a regular basis, I would choose the rotary mower due to long term cost savings!
_Go-TO GUY