I started in Electric Image, then moved to Lightwave. After that I moved to 3DSMax (my school changed their policy, forcing me to retake the class to relearn it).
This was a while back, but from memory, Electric Image had a more intuitive NURBS system. However, the system was flawed. It would work volumetrically, which was nice, but if you tried to export and import things, or tesselate them, you could run into irreparable problems with missing faces or errors.
Didn't see as many of those in Lightwave. Lightwave seemed different, but seemed like it had better surfacing tools. Easier to use and understand.
3DS has worse surface tools. That is, they're more powerful, but less intuitive and harder to get "what I want" when compared to the other software. I really like the animation control better than the other two, however. Much more control. I've gotten into the skeletal system and IK as well and I hear it handles them better than LW or EI (but, I confess I did not get as far in either so can't say from my own experience).