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Ken,
Flexure is you're number one enemy, so regardless of whether you mount side-by-side or piggybacked - or even build a craddle out of hardwood (and hey - that could actually work and be cheap). The single most critcal component in all your options is can you minimise differential flexure to an acceptable level for your goals. Some designs allow way too much movement of one of both of the tubes, and it only needs arc seconds of droop to spoil things. So all I can say is go robust. Losmandy gear is good, Robin Cassidy gear is better, ADM is fair to good.
My views having mounts 3 OTAs - two side by side and the third piggy backed - all with Losmandy gear
Matt
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