Drum mower. I got sick and tired of fighting sickles and all their hangups; must have had half a dozen over the years, and a disc moco costs too much money (I have a small operation). Besides, I don't like the mechanics of the disc cutting drive system. Too many parts to wear out and housing to break....every used one I ever saw had lots of braze welding done to the under side.
The drum is a walk in the park.