The Baumalight has a bigger cutting wheel, more teeth and is generally stouter.
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By "Stouter" do you mean more simple?
It's certainly not more stout, tough, and lacks many features. The miller main beam and cutter head, structurally, are welded boxes made of flame cut 1/2" steel plate, like an excavator dipper stick.... The Baumlight has the cutter head supported out in space on a peice of square tubing, certainly not 1/2" wall, not very robust, or stout.
And since the cutter head is just on the end of a "stick" you have no telescopic extension. That means you will need to raise the stabilizers and back the tractor up ~10X for every stump. Very frustrating, slow and inefficient....
More teeth = small chips?, costly to replace?, you only have so much horsepower in the tractor, more teeth doesn't mean much.
On that note, bigger wheel doesn't mean much either: Bigger wheel means more torque required to turn, which means slower wheel speed - since you only have so much tractor to work with.