A basic search tells me they're both ways to speed up applications/projects through memory management and storing of the memory/data in RAM. So the person in the article is asking a co-worker their opinion on which tool they should use for optimization/performance in their project, which is why an LLM response is less helpful than his co-worker's actual thoughts: comparisons of technical tools at a high or feature level are pretty easy to find and the decision of which to use often boils down to project specific variables, so what the author is asking of the co-worker relies on the co-worker's knowledge of their specific project.

I could also probably explain this just fine to non-tech people. It wouldn't be the most complete or technically accurate explanation, but it would be fine.

Most people write based on their experience and culture.

And the doctors at the hospital where I work still call us the "IT people".