CS88 is a connector course for amalgamating CS with Data Science. I would say that CS 10 is pretty much for absolute beginners into CS; Data 8 is for near beginners, and CS 88 is a next step from Data 8. (CS61A is the first required lower division class for computer science majors, but it is relatively speaking a very difficult class - I wouldn’t take that class until you have a solid programming skills background.) So by that transitive logic, yes, CS 10 would be easier than CS 88. In fact I doubt if you could take a CS 88 course without having taken Data 8 first.