No, not relevant any one will work.
Atomizers, foggers, etc were all made with the concept that the smaller, the water molecule particle, the greater the absorption. they do not guarantee absorbtion, or delivery. all they provide is a smaller finer spray....again to " allow for greater penetration"
the wording on these products are important, they allow or provide, however they do not guarantee delivery....and this is important as for a foliar spray to be effective it needs to get to the palisade mesophyll layer of the leaf.
http://www.bbc.co.uk/staticarchive/3b74df700f6b37803298234ddb3deff0d24aa41e.gif
if a foliar spray is not able to get to this factory within the plant it really doesnt matter how small or fine the spray molecule is, its not getting in or used by the plant.