Khrushchev's ploy re Berlin and Cuba was to counter the US advantage in Intercontinental missiles(ICBMs).The Soviets knew they were behind,feared a first strike,and attempted to use their more numerous MRBMs.This was termed "counterforce" in the jargon of RAND.Deploying their cheaper and easier to make MRBMs as a stopgap measure made some sense but Khrushchev was so bull headed about it.
The Institute for Strategic Studies gave the "Balance of Terror" as this in November 1962.(Source: Bulletin of the Atomic Scientists Nov 1994).
ICBMs West 450-500,Communist Bloc 75
MRBMs West 250,Communist Bloc 700
Long Range Bombers West 630,Communist Bloc 200
Medium Range bombers West 1630,Communist Bloc 1400
Strategic Warheads (ICBMS) are another issue:
1961 US 3153,Soviets 423
1962 US 3451,Soviets 481
Overall Warheads Stock(includes strategic,tactical etc)
1961 US 22,229,Soviets 2,450
1962 US 27,100,Soviets 3,100
It wasn't until 1977 (with SALT etc) that US warhead stockpiles were finally overtaken by the Soviets--25,800 to 28,400.Then off setting technical advantages like MIRV still benefited the US.
The vast US nuclear superiority in 1961,1962 also puts Khrushchev's brinkmanship in a different light.He had nothing to lose and might actually get something out of it.The US Right and types like Le May also didn't have much respect for Kennedy in not asserting US superiority ,I guess you could call it "sabre-rattling",but thats another story.