Is One Better Than The Other & Why?

Here's the third scenario. Dome piston with corresponding chamber shape. Think of where the spark plug is located and how far does that ignition of flame front have to travel. The shortest distance from all posable angles created by that ignition is best.
This sucks, piston to the right, flame front travel distance, go over a mountain and hope there wasn't preignition on the other side.,
To me, closed chamber and necessary size of piston dish to achieve the compression ratio targeted.