With liquor that can be a tough call at times. As a whiskey drinker, typicaly, I have found that if I have two Maker's Marks (on the rocks) I' can get a slight buzz on and feel fine in the morning. If I drink two Wild Turkeys on the rocks, I can get that same buzz but have a monster hangover.
I love four roses bourbon, but it will leave you a reminder in the morning. Quality and lack of hangover aren't necessarily related. You can filter the hell out of a scotch and take down the hangover factor, but I'd rather sip a laphroaig any day. I guess quality = no hangover works for vodka, but I object to paying more for a drink based on how little taste it has.
