Cylinder wall thickness vs head sealing

[Wally]

With aluminium cylinders (Nikasils): would a thicker cylinder wall (say 6,5mm) seal better than a thin cylinder wall (say 5mm)?

I know the larger surface area of the thicker wall should give less pressure per square [mm], but it has a greater sealing surface... so what effect prevails?

The question looks a bit like the question of what tires give the best traction: wider or narrow tires...

Thanks,
Walter