Hotpot also doesn't agree with my stomach, although there is a great variance on the level of discomfort.

From most agreeable to least, here is my personal list:

1) Nabe
2) Shabu Shabu
3) Beijing/Dongbei style
4) Sichuan style, especially mala

Other factors include:
1) Quality of the restaurant
-this isn't strictly correlated with price (e.g. I'm cool with big chains such as Xiaofeiyang and Hot Pot King even though they aren't expensive... though I will say that the really expensive spots in Shanghai tend to be pretty good, even if not worth their insane prices)
2) How nuts you go with the sauces and soup bases
-Mala alone is enough to set me off, but combining it with raw garlic, peanuts, chili oil, vinegar is just asking for trouble

I still enjoy eating hotpot (including the social aspects). I just know that some sort of stomach meds might be necessary post meal.