For me personally, I did not like the 3x. I ordered one of each, 3x and 1.5x. Selling the 3x. Just to me the eye relief was harder to pick up, but that has probably more to do with my eyes.
I found the 1.5x with the larger center circle reticle to be easy to pick up and quick to access. The 1.5x give it a bit of an edge over 1x. So thus, quicker to see and a bit of magnification as well.
Talking to Pete at Pj-Steyr, it seems the 3x though are much more in demand and way outselling the 1.5x. But, I like the 1.5x as more traditional and "combat/tactical" in a way.
The set up like states would not be bad either. Add the trijicon mini reflex on top of the 3x scope, then you get the best of both worlds.
Or you could get a A-3 rail model, then add a Manticore Talon mount and a Burris MTAC scope. Scope ability, plus a laminated circle reticle that at 1.25x acts as a Reflex.
Of course the nice option with the newer M-1 versions is you can also purchase a short or long rail and swap out the scope for the rail with different optic options.
Now, if you are looking at the weapon as primarily a close quarters/home defense weapon, then I would though go with the 1.5x scope and add a light source on the right side mount. That is what I am doing.
Or you could order a M-1 version without a scope, and just a rail, for several hundred dollars less and then add a Reflex sight such as a Meprolight 21.