Frost frost frost frost frost
Frost is hands down (IMO) the absolute best damage you can have. I would never raid without it on either your sword or your gloves. Even if I have a sword/glove that is a little better than my frost one, I will still use the frost one. That is not a problem for you, as your strongest one is already frost, so I would say most defiantly use the frost.
Frost slows units, which is even more effective than the panic effect of fire IMO because it effects monsters as well. Skull towers and wolves, the two biggest obstacles in a raid (IMO) are weak to frost. Towers get slowed down when hit with frost, so if your king can run ahead and start hacking at a skull tower, it wont shoot as fast and decimate all your troops. Monsters get slowed pretty good as well, so that ogre might not be able to play whack-a-mole with your troops as much if he is slowed with frost.
If you are good at keeping frosters alive, they will obviously slow things too, but they cant run up ahead like the king and get those tricky towers. Fire is only good at panicking troops, and I dont think that even works on monsters does it? Barricade is weak to fire, but atleast at my lvl (85) a king aint gonna hack away a boosted barricade without spells anyways. Frost hands down.
Plus…good lord that frost sword has like 230 more damage than your old one, why are we even having this conversation?