it's subjective.
The Speedmaster brand has the legitimacy of the moon watch behind it, but no serious aficionado would really fall for that. If you where to ask between a vintage speedmaster or a vintage seamster Planet Ocean (which really there is no vintage as it is a 90's design) then the speedmaster moon watch would win.
If you're asking between a speedmaster ceramic modern watch and a Planet Ocean ceramic modern watch it's entirely up to your taste. Do you like pilot watches, Chromo's, racing...or do you like submariners, diving and adventure tool watches.
Even then both are gimmicky (if certainly imposing) and neither is really meant to be used on their natural tool watch habitat. If you want something that can go into the water and out get the PO, If you want something that makes you look like you just stepped out of a rocket to marts get the speedmaster.
If you want a watch get a Seiko.
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