Harriet Lane is a great pocketbook for use during residency.
As far as Nelson's vs Rudolph... usually if there is a discrepency or some sort of controversial information... the boards tend to be more reflective of what's in Nelsons. Unfortunately, Nelson's is a crappy read. Rudolph seems much more tolerable. They say if you work at reading 5-10 pages of either of these books in a week, you're at least gauranteed to finish one of these textbooks during residency.
Good luck,
Nardo