Rotary Brush or Sickle Mower?

[Matt400]

I have an area of about 5000 sq feet that is rocky uneven terrain at 3500 feet elevation I need to keep a handle on.
In the past we have used a powerful weed eater with heavy line but that’s a big job carrying that around the field plus it won’t cut heavy brush. I have a saw blade for the weed eater but it’s time consuming to change out and really doesn’t work that well.

So I was thinking about a DR field and brush mower for the larger area and the weed eater for the steep bank. Then I was looking at the Sickle type mower and it looks lighter and more maneuverable while cutting a wider path.
The DR product mulches which is nice where the Sickle just lays it down.

My question is- who has used these machines and how well do they work? I am afraid of tearing up the DR by hitting dirt and rock clumps I cant see where the Sickle might be more forgiving, dunno. Which one is better for traction and such?

Due to the terrain I would rather walk behind a powered mower than ride something, I have been out there on a Kubota tractor and felt I could easily roll it in many areas.