I was a Jack Daniels drinker that switched to Vodka once I went over the edge. Reasons were simple for me. It was colorless so I could put it in a water bottle and not seem lecherous when I grabbed a drink on stage; pretty much tasteless (to an extent) meaning that when I would take a drink I could drop more down my gullet with each swig. That's hard to do with Whiskey/Bourbon, even for seasoned career boozehounds like myself. The odorless thing never entered my mind really, it was more about the ability to down larger amounts of it in one swig.
Also, I guess it might not be a coincidence that I switched to Vodka after a 5 month tour in Russia. Hmmm...
