Question

Which is the strongest, the strong force or gravity?

Answer 1

You can't compare the strong force with gravity.

Explanation:

The strong nuclear force is very short ranged. I binds adjacent protons and neutrons in an atomic nucleus. It is very strong in the nucleon range. At this range gravity is very weak.

At the scale of planets, solar systems and galaxies, gravity rules supreme. The strong force has no effect at these ranges.

So, you can't compare the strong force with gravity as they have hugely different ranges.