(Minecraft Mods) Should I leave Forge on my outdated computer or bother and install Fabric?

A friend of mine says that Forge doesn't work properly on an old PC like the one I have. And crashes after a while. To the best of his knowledge, Fabric should be doing better. What do you all mean? Fabric or Forge?

Fabric should apparently run better, yes, but it has fewer mods.

I know that. Perhaps I formulated my question too imprecisely, rather I wanted to know whether someone can tell from their experience whether Forge is really doing that much worse.

Not much worse