For me - its best to measure apple with apple - both the Omega and Rolex earmarked are not built as 'tough as nails' watches like the Extreme Chrono. So my vote for Rolex.
If you finally chose the EWC v. Omega Seamaster ProChrono (OSPC), this could prove quite controversial - just imagine the outcomes:
1. EWC passes Omega fails - no controversy as EWC is DESGINED for punishment
2. OSPC Passes EWC fails - Great result for Omega murders reputation of JLC!
3. Both OSPC & EWC passes - OSPC benefits more than EWC as it was not built for that purpose!
4. Both OSPC & EWC fails - OSPC suffers less than EWC in terms of reputation as its not built for that purpose!
So - not a fair comparison!
Cheers!
HarryTan