which alcohol has less impact on the stomach

I’m in my late twenties, and for the last couple years, my stomach kills me in the morning after a night of drinking. I don’t need to get blackout drunk either; even two or three beers can do it. Beer, wine, neat whiskey, and whiskey with coke all cause issues. Only neat Jägermeister does nothing to my stomach in the morning.

What do you think about it? Which alcohol or mixtures have less impact on the stomach, in your opinion and experiences?