I'm not sure that this is a comparison of apples v apples.
The Rolex is very much more an upmarket watch, the OP has white gold fixtures and fittings on the dial, it has a polished bezel all of which give the watch a more upmarket look. The Omega is by comparison more workman like, painted indices and steel hands, a fully brushed case and bezel.
But of the two I would buy the Omega, I think that it is a better looking watch, I maybe a touch biased as I have the Railmaster and it is just awesome.
Mine originally came on a blue denim / calfskin strap, I have changed this to Omega's tan leather strap and deployant that is used on the Seamaster 300 and Aqua Terra which sets the dial off beautifully.
Pictures below show Railamster lume with the watch on its original strap and then on the tan leather strap.
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