I'm sorry, I was under the impression that "best" refers to whatever you like most (for whatever reason). "Most effective at killing monsters" isn't mentioned anywhere. And even if it were, it's the damage of the weapon that determines its effectiveness, not whether it has Freeze or not. Freeze only helps prevent you from getting hit. I would consider a higher damage weapon with no freeze to be more effective than a lower damage weapon with freeze.
Yes I read your comment about the bow, but I don't see how it changes anything.
Let me put it this way, why do you think that a weapon with freeze is "more effective at killing" than the same weapon without freeze?