Swarmers and volume punchers are normally the worst to fight.

There is an old generalization in boxing that works kind of like paper-scissors-rock:

Swarmer beats boxer... he isn't dissuaded
Boxer beats slugger... he hits and doesn't get hit
Slugger beats swarmer... he makes him pay

That's an oversimplification as things get more complex at higher levels, but it gives you some idea.