I'm not into toys enough to know what are significant differences and what are superficial differences, but I was impressed with a Spider-Man figure I picked up many years ago on the cheap, as it featured so many points of articulation and such a wide range of possible movement and poses. I think it was this one:
The arms bent at the elbows and wrist, fingers moved, legs had ankle and knee joints, the head could rotate around on the neck, even the torso had articulation. It was a pretty good figure.
The toys of my youth were mainly of the chunky basic action figure variety (where you could move arms and legs, and swivel the head if you were lucky), like this:
So the Spidey one seemed pretty impressive in comparison!
Modern transformers figures are pretty great too, even the cheap lower-end ones - there's some wonderful engineering to make the transformations work, and the figures function in multiple modes - but then I've always thought that about transformers.