Essentially just the title. Why might one want to use Fabric or Forge over the other? Does one have better support for X features over the other? What are the differences in philosophy of the two projects that led to these differences?
This is just based on my really minimal understanding of them from years ago. Fabric is much more lightweight than Forge. Forge (at least for a while) patched everything everytime you loaded up the game. I believe Fabric was made to load quicker. Forge may be different now.