So far as I know, isopropanol, ethanol and denatured ethanol should all be pretty much interchangeable in this application. The chemical properties are pretty nearly identical for these purposes.
The downside of ethanol (as in Vodka) is that it costs a relative fortune, due to taxes. Denatured ethanol is only made because if you render the stuff undrinkable, you avoid the taxes. What's sold as denatured alcohol often includes some methanol or (I think) isopropanol. Sometimes the denatured alcohol you buy at the drugstore has some scent added too, I guess just to make it more pleasant to smell and less likely to be consumed.
The advantage of Vodka is that you can be pretty confident exactly what concentration it is, and what's in it. The labeling on denatured alcohol can be a bit spotty. Also, of course, it does double-duty: you can drink it if you feel like it, and if you do so by accident, it'll be more pleasant than if you did the same with denatured alcohol, or, really, if you didn't drink anything at all (at least in the short term).
You want to keep the concentration around 50% alcohol (i.e. 100 proof) to avoid flammability danger.