What's the best spell to freeze enemies?

I'm trying to make a build using freeze as crowd control. I don't know, though, which spell would work best as a way to freeze enemies, without worrying about using as the main damage dealer in the build.

IMO, the main options are:

1; Cold Snap: now has a 30% chance to freeze at all levels, a nerf considering how it did reach higher changes.

2; Freezing Pulse: has a chance to freeze, but the game doesn't state what it is (assuming that it is any higher than the raw chance given by cold damage).

3; Ice Spear: the secondary explosion has a very high crit chance, which should freeze most enemies, but the skill has no inherent chance to freeze beyond the raw one from cold damage.

4; Artic Breath: creates frozen gound to freeze enemies.

Ignoring damage dealt and focusing on trying to freeze enemies, what is the best option?

Freeze Mine. It always freezes if you make it past the 300ms threshold.
If the mine laying mechanisms bothers you use
trap - cold snap - concentrated effect - elemental proliferation.