Depends which model. But given the lack of info, Omega wins hands down and thats reflected in the price too.
As a first watch however, Longines Legend Diver is good value for the price - smart vintage looking, great lume and classic design which has stood the test of time.
The Seamaster 300 if you have the budget for it, should be the watch u go for if you want a diver, can't go wrong.