The Optima is a good gun, but in reality they all will shot just about the same.
Any MZ with the same length barrel using the same ignition system, 209 primers, with the same powder and the same bullet will generate the same velocity and ballistics.
However, you will need to find what bullet, sabot, powder each individual gun likes best to maximize it's potential. Any of those guns you pictured could easily be set up at under 2" at 100 yds all day long.
And again, even though you can fine tune with loose powder and reduce groups, to kill a deer it is not needed and pellets are as convenient as it gets. I don't personally care for them much and haven't used a pellet in a long, long, time but they get the job done just fine but do burn very dirty and offer some other challenges but they can be overcome.
Note - Triple 7 is apparently an gluconic acid (sugar-based) propellant. In many guns it leaves a "crud ring" near the breech plug area that can make it very difficult to seat the next load. A spit patch between rounds normally solves this issue as T7 is water soluble. All BP substitutes are very dirt burning powders, Pyrodex which still has sulfur and is very corrosive, Triple 7 with sugar base that crystallizes and leaves a bunch of residue and then BH 209, the newest addition to the market a few years ago that offers better velocities per weight and is much, much, much cleaner burning and is "non corrosive" If I were looking to purchase a new MZ today I would purchase a gun that is BH 209 capable.