What is the unhealthiest alcohol?

I'm curious, when it comes to alcohol consumption, which type of liquor is considered the unhealthiest? Is it the high-sugar content of cocktails, the harsh burn of straight liquor, or perhaps the high alcohol content of spirits? I'm looking for a deeper understanding of which alcoholic beverage may pose the greatest risk to one's health and well-being. What factors should one consider when trying to make healthier choices regarding alcohol intake?