What’s your cite for that? Here’s one small study suggesting that impurities (fusel oils, in this case, although fusel oils can be part of the flavor profile of various alcoholic drinks, like whisky and some ales) cause a worse hangover than “cleaner” alcohols. I found that because, in my experience, drinks with an increased presence of fusel alcohols seem to cause worse hangovers for me.
An, of course, here’s a study disagreeing with the fusel alcohols explanation for variance of hangovers.
edit: And here’s another one suggesting the type of alcohol does affect the hangover.
From your sources:
[quote=The Alcohol Hangover
right arrow Jeffrey G. Wiese, MD; Michael G. Shlipak, MD, MPH; and Warren S. Browner, MD, MPH]
The absence of a standard instrument for hangover assessment makes comparison of treatments difficult
[/quote]
Indeed, there is no standard of measuring a hangover. This makes it pretty tough to study when that is the standard you use.
Edit: I was checking coding and hit quick reply instead of preview. I currently don’t have access to a journal search so I was going to debate you on your sources, but this is rather petty and lame. I won’t continue nitpicking and concede I don’t know enough on this subject to back up my original claim.
Re The OP’s question: Excepting cheap rotgut contaminated with lead or methanol or other poisons, ethanol is ethanol when it comes to hepatic injury.
Well, if you go for the stuff they keep way up on the top shelf like the Snapple Iced Tea, you’ll definitely avoid both liver damage and the hangover.
Alcohol is alcohol. Over indulge, and you’ll have a hangover. Drink way too much, and you’ll get liver damage. Ed Wood, the famous director/producer/writer of such hits as Plan 9 from Outer Space, drank himself into severe liver damage, but he only would drink the premium stuff even when he had little or no money.
Is there a difference between top shelf stuff and lowest cost garbage? There’s probably some difference. Famous brand beverages will use better ingredients because their quality is what people want. The dregs are dregs because they use cheap ingredients. People drink the cheap hootch not for the flavor, but for the buzz.
Then again, just because there’s a large qualify difference between a $50/bottle scotch and the $2 variety doesn’t mean there’s a big difference between the $50/bottle top brand and the $25/bottle not so well known brand. Marketing is king, and much of what we perceive as high quality is simply due to the effects of marketing. We all have fallen for it.
The main thing is that it is the alcohol that causes the hangover and the liver damage. Buying the top shelf stuff isn’t going to save your liver if you are over indulging.
Remember: Drink moderately, brush your teeth after every meal, and don’t wear stripes with plaids.
A bit less snark, if you please.
**
Gfactor**
General Questions Moderator
[Moderator Note]
Superhal, insulting remarks like this are not permitted in GQ. Don’t do this again.
Colibri
General Questions Moderator
[Maxwell Smart]Missed it by this much.[/Maxwell Smart]
What he said. 
$30 for three top-shelf drinks and cab fare? Is the fancy club in Wyoming? Across the street from whereever the taxi is taking her?