I've found it easier to use the S version because of its smaller spread, but at the same time I prefer to get used to the kicking power that the normal variant has. Still, I hate the AK for that same goddamn reason. ;-; Welp, gotta pick it up again.
M4A-1 S: -Very accurate. Mid/long range head tapping, controlled bursts. Great for maps with long open areas (Dust II, Train, Overpass, Cobblestone) -Good for flankers both because it's silenced and because of the long range aspect also -Huge barrel makes it hard to hide around corners -Can't take down more than 2 or 3 enemies per magazine (or just one if you miss a lot) so it sucks at defending against rushes -I wouldn't recommend holding a site alone with this. Really good for crossfires because it confuses people. M4A4: -Best at close/medium range because of the ability to spray a lot. Good for holding tight choke points and preventing rushes (B site Dust II, B site Mirage, B site Inferno, Inferno apps) -Great against rushes, can spray down multiple people (ez 4ks). You can hold a site alone with this if you're good -Harder to control -Loud Personally I prefer the M4A1-S, but I do switch to the M4A4 sometimes.