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My experiences with both are varied. I found that using a side by side system (made by ADM) introduced too much flexure and this gave me elongated stars. I actually think that the problem stemmed from the use of the Takahashi clam shell and some slight flexure on the rear of the guide scope.
Since going to a piggy back design, I found that this error is all but gone. There is more rigidity in the design and less likely to prove problematic.
If I were to use a side by side again, I would go with a much heavier system and with more rings to hold everything in place.
My vote is for piggy back.
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