I haven't been playing too much of the multiplayer to have unlocked any of the cool toys (I'm only rank 10 or so), but I can tell you that when I'm playing Spec Ops Survival games (where I'm maxed out at rank 50) I never go anywhere without my MK14 with ACOG and under-barrel shotgun attachments, capped off with the Stalker perk.
Although on my last (first) killstreak unlock in multiplayer I chose to unlock Ballistic Vests, so I suppose my natural inclination is towards the Support package.
Although on my last (first) killstreak unlock in multiplayer I chose to unlock Ballistic Vests, so I suppose my natural inclination is towards the Support package.