I voted China based on manpower, if the nuke didn't exist they'd have the edge. I'd like for someone to point out a war that the US won alone, and no nukes were used in.

There are way too many factors to say who would win over who, take Vietnam for example, not only was it the intricate bunker systems but it was mainly the terrain. Manpower didn't win the war, the region fought a lot of the battle. Factors like terrain, manpower, technology and even strategy and morale have a big impact.

Would need more of a precise situation to give a proper vote.