I have both these watches. In my case, I have the titanium Planet Ocean Chronograph but basically the same watch - and for the record I love both of them.
That said - get the Rolex. Don't get me wrong I am entirely happy with the Omega, it's a brilliant watch and I do consider it to be on the same level as the Rolex quality-wise.
But you're still better off with the Rolex. It's a staple bedrock watch for any collection and the resale can't even remotely be compared.
