Well the current trend is flat top pistons and small combustion chambers which work better than the old domed pistons and open chamber heads. Figure the rest out your self I'm not your mom
Small combustion chambers only work better as far as quench which the intent is primarily to run pump gas without detonation.
Some designs of small chambers inhibit the breathing of the head.
Flat top Pistons on a modern build are really only possible on a stroker build because of the increased swept area, otherwise it would be very hard to get any kind of decent compression.
Each type build has its pro and cons. It depends on the intended goals of the build and operating costs of the fuel.
