Hmmmmmm..... good question !
My wife might ask the same one as when she is not having a small glass of wine with our daughter she just loves a spiced rum.
Not being an expert - WHO ME ?
- on these other spirits I cannot say if they contain fusel oils or not. I will have to look into that one.
I can say that the better vodkas are almost all triple-distilled these days and while they still have the same ABV they do not have the same long term effects as whisky, ( Scottish ), whiskey, ( Irish ) or Bourben or Rye from America.
I would be willing to try to test them all for you if you could send me a case or two. As far as taste is concerned, IMHO, in small doses, the best whiskys' are The Glenlivit - single malt - or Highland Park - single malt - even if the latter does not come from the Highlands at all; it comes from Orkney.
I guess, as my old Irish grannie used to say, "There are no bad whiskeys', just some better than others!"