I am new to the game and just joined the group. I would like to take a dig and see if I can play this hobby/game well.

Prior to miles knowledge, I have 3 cash back cards and 1 Chase freedom. Recently I applied for 3 miles earning cards. Should I cancel few cash back cards or stay with them?

In other words, are airline/hotel miles more worth than cash back cards? Thanks!
My credit score is > 750 but it does say too many accounts open.