I asked this question that compared the physical strengths of Hodor and the Mountain in GoT/ASoIaF. It was quickly closed as being "primarily opinion-based," but I tried to make clear that I wanted to know about specific feats each character performed "on-screen" in the books or show. How is that opinion-based?
The only reliable way to compare their physical strengths would be if they both performed the same feat and the success of each of them could be measured in some way. Even then, as DavidW points out in the comments, we would only be comparing strengths for that particular task and the results might be different if we looked at a different task.
Trying to compare physical strength by looking at very different feats is inherently opinion based.