How is one black hole is larger than another?

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Black holes vary in size due to their mass, which determines the radius of their event horizon. While black holes theoretically collapse into infinite density, current understanding suggests that our theories break down inside the event horizon. Consequently, discussions about the internal structure of black holes are largely speculative. Instead, measurements and descriptions focus on observable characteristics from outside the black hole. This highlights the limitations of our current theories in fully explaining black hole behavior.
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If black holes crush things into infinite density, shouldn't they all be the same size?
 
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Black hole size is expressed in terms of its event horizon, which is proportionate to its mass.
 
(Note that when I say "inside a black hole," I mean "inside the event horizon.")

To elaborate, nobody really knows what on ... in the Universe happens inside a black hole, our current theories say they should collapse into 0 size, but some (a lot, from what I gather) think this just means our theories no longer apply perfectly in these situations.

So trying to describe stuff in terms of what's going on inside a Black Hole is going to be pretty much pointless, so we have to describe stuff in terms of what can be measured from outside the black hole.
 

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