Shaman Slowing

[Evia]

So I'll admit it was years down the road for me before I learned that an Enchanters lvl 4 mez should generally be used over the higher lvl mezzes. I was curious if it's the same for shamans slow spells? Is there a low lvl slow that is generally viewed as the "main" slow to use? Or is the best slow for the lvl always the one you want?