I took the FE in 1996, and that was the first year they had the choice.
For me, it was a complete no-brainer of a choice. I'd been out of school and come back, so all that math and physics was ancient history, while the stuff in my own discipline was freshly learned. So I took the discipline-specific exam. In civil engineering you can get away without knowing the finer points of math & physics, so by taking the CivE afternoon test, I didn't have to bone up so much on the general stuff. Some of my classmates chose general because they were afraid of the discipline-specific material, and then complained because of the depth of the math & physics they found on the general.
For ME, you may very well have to know all the math & physics to that depth anyway just to do the ME problems. I don't know.
Hg
Eng-Tips policies: faq731-376