Knowing nothing about your priorities for the watch purchase, I would have to say the Omega, provided it's one that has the co-axial 8500 movement (or a variant thereof) inside. That is one of the world class movements and is on par with stuff form brands costing thousands more, and that's before even considering the discount one can get either from an AD or a grey market seller.
There are fancier and pricier watches than Omega's, but the Seamaster is among the best watches one can buy. It also happens to be one of the best values in watches at the moment.
Here's some reading that you may not have encountered.
http://www.watchtime.com/reviews/mas...er-aqua-terra/
http://www.watchtime.com/reviews/san...ng-superocean/
All the best.
PS
Prior to the 8500, there was the 2500 co-axial movement. There's nothing wrong with it, but it's not in the league of the 8500. Omega have been spreading the 8500 across its product range. I don't know how far they are in that process, but I do know the 8500 is the one to get, so I'd check to make sure when buying.
FWIW, for it has nothing to do with the watches themselves, neither brand has a bad name, and Omega by far has greater brand recognition and arguably is more fondly regarded.