The Air Arms Pro Sport is one of the nicest spring piston rifles made. It enjoys an excellent reputation, as do Air Arms air rifles in general, springers and PCPs. It's also the most expensive. All three rifles in the poll would be about equally loud.
As a point of interest, air rifles are probably even more picky about their ammo. That is to say, they can be more picky about getting the right pellet as .22LR rifles are about getting the right ammo. Just as there are few manufacturers of quality .22LR ammo, there are only a few manufacturers of quality pellets, JSB (which also makes Air Arms pellets), H&N, RWS, and Crosman.
With pellets the make, size, and weight are all factors that come into play for accuracy. Each pellet maker's pellets are of different hardness. Shape also varies between makes and varieties within makes. Size varies by pellet head size. For example, .177 pellets are nominally 4.50mm in diameter, but they are available in head sizes from 4.50 to 4.53mm. The larger .22 pellets are available, in different makes, in 5.50 to 5.55mm. Both .177 and .22 pellets are available in different weights, the heaviest among them specifically made for powerful PCP rifles.
To put it succinctly, there are many more flavours of .177 than .22 pellets. That is one of the reasons that .177 is preferred more often for target shooting. If the purpose of the air rifle is target shooting, go with .177; if it strictly for hunting then it doesn't really matter. Although the .22 delivers more energy, game like rabbit is regularly taken in the UK where air rifles have a 12 foot pound energy level unless the owner has a FAC (in Britain, the Firearms Acquisition Certificate). Twelve foot pounds in a .177 with an 8 grain pellet has an MV of about 800 fps.