Nursing or radiology?

I am having a very difficult time deciding between nursing school or radiology school. Does anyone know which is harder? (yes i know they are both hard) Can you shadow a nurse or radiology tech at any hospital and how do you go about doing that? I am really interested in shadowing someone but I don't know how to do that. Also, those of you that have been through the program, did you think that the program was harder or the pre requisites? (math, biology, anatomy, physiology, etc.) Thanks for your time!! sorry i just relized i posted this in the wrong place.