You'll get mixed responses on which was bests.
I like the Omega because I could remove the decocker levers and install the safeties and carry it cocked and locked, like my CZ75 Compact, P07, etc.
Some people prefer the decocker models and see no need of an Omega model that allows you to set it up for the safeties.
As to why they stopped making them? They'll never tell. They've quit making darn near everything I liked or bought. Don't need any of what they are currently making. I've got extras of what I have in case they decide to stop supply parts, too. And a drawer full of parts I've bought over the years.
I'm sure, if you look, you can find P01 Omegas on line or at gun shows. I found an old P07 DUTY .40 S&W last year at a gun show, still in it's box with the manual, cleaning stuff, safety levers in the bag and two magazines. One of the mags was perfectly new and appears to have never been inserted into the magazine well. Both had sticky labels on them to show they were .40 S&W mags and those labels were perfet/unscratched or torn. That gun was made in 2010. Look and you'll find the P01 you want sooner or later.