It depends what you think is most painful. I've had experience with in house call and home call, but not night float.
I would think night float would be the worst, as you would have to take care of all the ER consults and the scut, but your operative experience wouldn't be great, which at this point should be more important than splinting someone's ankle.
In house call is obviously painful, but it's a known entity. You're in house, you know you're going to get lit up, but you also know that the cavalry is coming in at 6 am, and with the 80 hour work week, you're leaving at noon.
Home call, personally, is the most painful. You're at home, comfortable, but then you have to leave the comfort of your sofa, bed, girlfriend, etc to go take care of things. Also, it's kind of a way to get around the 80 hour work week, because even if you get smoked and are at the hospital all night long, you're still on the hook all the next day, which can be painful depending on what you have to do.
Hope that helps. Obviously, this is only my opinion. I know alot of people who prefer home call to in house call, so it just depends on what you hate most.
Later players