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About the meridian the side by side requires less dome aperture width than piggyback.
The SBS hardware is heavy, so for a heavy plus light scope combination, the PB configuration will give the lower total load, i.e. scope and counterweight, on the mount.
With two heavy scopes, the reduced distance from axis of the SBS will require a smaller counterweight and give a lower total load.
Total load and pier/tripod stiffness determine overall vibration.
If using a range of scope combinations the SBS is far more convenient.
Both SBS and PB require a little more work to zero out cone error.
The image shows what I use.
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