Hi Kev, I think they both are just as good. It all depends on how one visualize different objects. I like the butterflies only because I "see" the solid three dimensions of butterflies better. I can think of the blockages flying out of my body.
As for the smoke, yes, see that too. However, sometime it is hard not to think of the body is having hot air coming out, like someone is very angry. Just hard to keep the mind in check being empty.