I used to be a hardware tech. Pretty stressful. I'm sure there are others out there who understand when I say you would get that sick feeling in the pit of your stomache when you heard the pager go off... especially during the super bowl!!!
Now I'm in Open Systems Services, where we basically manage Windows and UNIX servers, as well as networking equipment. I have a set schedule, no on-call rotations, and very little stress.
Hopefully soon I'll be taking a UNIX admin position. Bring on the stress!!!