Hi Sara!
I think most of us doing Bigger and kind of new to HOD have asked this exact question. (I know I did...

) You're meant to do both Storytime and DITHOR in Bigger. They focus on different skills even though they do both cover the literature study of the different genres/story elements/character qualities. In Beyond and Bigger, the storytime covers the genres so that if your child is not yet reading independently enough to use DITHOR, that is already covered within the guide. You're meant to do both the storytime box and one of the options for reading though.
We found the opposite of Patty. We ended up with the genres "matching" for DITHOR and Storytime a couple times, and found that we really preferred that they be different.

It works either way! We found that we liked coming back to the different character qualities/story elements after a time.
We have wonderful memories of Bigger!

You'll love it!

Kathleen