a “snickers” is more thicker and denser. when you bite into it, it coats the tongue and all the senses of a decadent candy bar. when you bite into a baby ruth, it sort of breaks into glass-like chocolate shards. the nuts in baby ruths are, well, bigger.
Snickers have the nuts in their nougat and Baby Ruths have their nuts surrounding the nougat. I know I will get some grief on this answer, but didn’t know of any better way to answer it.