Really? I genuinely found it easier to cap...i'm not randomly talking out of my ass, so that's pretty surprising. Either way, the assault class is better to cap with as the "mag dump" is pretty effective (although I still haven't learnt to really use support's pistol).
The supports pistol is shit. It's accurate enough to make it hard to use with no crosshair, but it's not accurate enough for long range. The assaults autopistol is great for ghost capping.