The main differences here are fire rate and recoil. While the Galil, Commando, and AK47 all have essentially the same stopping power, the AK proves to be the hardest to handle at longer distances because of its high muzzle rise. The Commando has the least recoil of the three, but is significantly harder to control when using a suppressor.
The Galil has somewhat bouncy recoil, but fire in controlled bursts and you can literally use it as a sniper even with a suppressor. The sights are another issue. As for the Famas and AUG, they have the same rate of fire are both most effective at medium to close-range and have almost identical sights (the AUG's being similar shape but larger proportion to the Famas').
As for the recoil, they both have significant muzzle rise, the Famas having the more difficult to handle. Where the AUG's recoil tends to circle around a target with sustained fire, the Famas has an upward-right rise which makes recenter on a target difficult without short bursts. Basically, it's all going to come down to feel and your personal preference.
Make 5 identical loadouts (same perks, attatchments, etc) with each gun and try out each one in a game and see which best suits your style of play.
One of the more important things to consider is the shape of the irons on the weapon. How does the site affect your ability to target an enemy? Is it open, is it circled, does it have two prongs or one?
These are important things to compare. I find that the circle site with the short prong on the galil makes it easier to target enemies at greater distances. To the contrary, the open site on the ak47 makes it easier to target close-range.
I think that the sites on the famas and aug are the best overall because of their 3 prong half crescent shapes, however the way the guns behave with recoil (mostly dragging hard in one direction) makes the awesome sites irrelivant unless you perfectly burst fire. In my opinion, the commando is the best of the ones you named. If you want to see the differences for yourself, I recommend playing some games in the "pure" gametype mode.
Its in one of the online menus.
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