To the best of my knowledge -there are 2 different "Omega" 75s. One is the original Omega, that had simpler lock work, but was a safety only version- this has the curved trigger. The newer Omega is a omega convertible with the P09 like trigger, also similar to the P09/7 and P01 omega in that in addition to simpler lockwork, it can be converted from decocker to safety.
If you can find a 75 Omega convertible- get one. Based on my experience w/ my P01 omega, I suspect it'll be a superb gun.
Hope this helped