The guys over at CopTool put together a really good video comparing the two carbide hole saws, but they make it very clear that these two hole saws are not in the same class. While the Milwaukee Big Hawg is meant mostly for wood, the Bosch Carbide Saws are meant to cut through a range of materials.

While watching the video keep in mind the 2-1/8" Bosch Carbide Hole Saw costs a little more then double the price of the Milwaukee Big Hawg

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You can pick up your Milwaukee Big Hawg or Bosch Carbide Hole Saw at Amazon.

Related reading:

New hole saws from Milwaukee

Bosch has carbide hole saws.