Here are the differences between Angell and Angell S:
Weight: 13.9 KG
Colours: Black and Silver
Ideal height: Optimal for people between 1.65 and 1.95m tall.
Weight: 12,9 KG
Colours: Black, Silver and Green
Ideal size: Optimal for people between 1m55 and 1m85cm tall.
Frame: Lower, so it's more suitable for women.