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Here’s what I see:
Some advantages of a flat top piston:
Less surface area
Better squish/qwench possible – very important in some cases
Advantages of a dish:
More efficient and compact combustion chamber possible
Eliminates squish where it’s undesirable, as in some all-effort Nitrous applications
Best of both worlds would be a well designed small dish as seen in the engine masters, where the piston dish is nicely mated to the combustion chamber on the cylinder head, resulting in a very compact and efficient combustion chamber, where there is plenty of squish to cause the desirable charge motion and turbulence to have a faster more complete burn.
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