There can be many different answers based on circumstances. What mount, fixed or transport to dark site, weight to lift, type of imaging, budget of buyer, room for storage or observatory, etc etc....
Personally I believe the 'sweet spot' is around 10" , still light enough to handle and transport, doesn't require a monster mount and cost effective in most optical designs except refractors. Big enough for DSOs.
If there were no barriers to entry, i'd opt for a Planewave CDK - the smaller one.
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