I find Licor 43 to be too sweet. I'll tolerate Grand Marnier with the right amount of ice, but I'd rather have it mixed into a sabayon and dolloped over some fresh berries. (I've never gotten into ouzo, sambuca, etc. I don't really like that flavor profile, but probably also traces back to some bad experiences in college. <shudder>)

My parents have always liked Bailey's but I find it to be a bit...generic and chemical-y. So I've gotten them drinking Amarula instead.

In addition to Drambuie, I also keep B&B and Tuaca around. But for something with an oomph, I always go with a good amaro.