Shall I choose web builder or CMS?

「Snowyn Editor の話 Prologue」This is a layman question. Before I decide, I must know the difference between web builder and CMS (content management system). But I won't ask what's the difference between web builder and CMS, as it sounds too technical. And I do not need to know every detail but wanna get a quick snapshot which is suitable for me.

1. How does web builder interface look like.