I have been wondering the same thing, 32 or 36. We plan to add a new 3100 this year..
The 32hp on the 3100 we have has plenty of puwer but a bit more never hurts. My main concern would be fuel usage.
Really the 30hp on our 2000 does a good job. The 2000 has held up very well but it is not worked as hard as the 3100.
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