Zastava-Arms
Banned
Apache would get my vote. Though not as resistance to ground fire as the Hind, its longbow radar more than makes up for it. It's extremely silent ( for a helicopter) and from it's performance in war- its no ones fool to be messed with.
The M-24 performed admirably in Afghan nearly turning the tide in favor of the soviet empire-able to transport troops, and could soak up large amounts of fire- even from RPGs. Yet against true AA weapons such as the Stringer it had the heat signature of the sun- meaning it had no place to hide when a army has AA capability.
The Soviets later on made modifications to the Hind to reduce its heat signature.