There is no difference in commonness between

and

, they are both coeff 3. Now that I have them unlocked, I see one just as often as the other.
While

may kill all of the enemies at one (and thusly quicker) I will not take care of everything (that's to say the baby apricots) in the way

does.
Also, when you get a

, even as the enemies die, the explosion apparition in the foreground center of the screen obscures what could be anything; spikes, seeds, and most importantly the big crystal itself can be hard to catch because of this if you are unlucky. With

, the image appears in the background and you can see exactly what is happening.

>

Clearly and forever in my opinion.
The only advantage I can see to

in every or any case is that if you die before the items is finished working (as in all enemies are off the screen) You will still get the big crystal, and

will stop killing enemies if you die.
But you shouldn't be dying anyways.
On an unrelated note I want to incorporate river salt into my signature when I unlock it. How can I do this I wonder....