Okay, let's consider a few things first.
Firstly, stop talking about superiority of training and all that stuff. You can expect soldiers on both sides to be competent enough.
Neither side would fall comically short of the other somehow in training, that's just nationalist propaganda talking.
One needs to talk about strategic and tactical advantages of numbers of troops and equipment available at start, as well as war potential over time. Let's say that both sides can field a total of 1/100 their population at conflict start, and 1/10 of it when their war efforts are pushed to maximum.
We'll take the situation of the conflict starting in 1980, where PACT attack first. Populations.
NATO
US, 226 million
West Germany, 62
UK, 56
Italy, 56
France, 53
Canada, 25
Netherlands, 14
Belgium, 10
Portugal, 10
Denmark, 5
Norway, 4
TOTAL: 521 Million
PACT
USSR, 260 million
Poland, 35
Romania, 22
East Germany, 17
Czechoslovakia, 10+5
Hungary, 11
Bulgaria, 9
Albania, 3
TOTAL: 372
From these things that I googled, we can see that the PACT actually has a pretty big maximum manpower shortage compared to NATO.
So say that PACT attacked first, and started with a larger number of troops compared to NATO, by drafting in preparation.
PACT attacks across with a force of 7.4 million men, and NATO starts with 5.2 million.
Tactically, they would have the advantage in their ground war early on. Strategically though, NATO had better growing economies at this juncture, meaning that they would not only be able to deploy more forces than the PACT in terms of numbers, but that they've be able to equip them better.