EQ6-R would carry higher payload and should have better tracking/backlash characteristics being belt driven.
The SW 100 being f/9 is not a good choice for AP...not because it isn't a good scope (it is), but f/9 is slow photographically. Look for a faster triplet, f/5 - f/6.
Oh, and AP is not an inexpensive hobby, but everything is relative!
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