Doing 1 thing everyday or plan a day for 1 thing

I am trying to make my weeks more effective and I'm curious what works the best for you guys

A. Doing a few habits everyday
B. Planning a whole day for one thing

Example A:
30 minutes sales
30 minutes of reading
30 minutes strategic focus
30 minutes of writing
15 minutes of administrative
60 minutes for product development

Example B:
Monday: Sales
Tuesday: Administrative
Wednesday: Product Development
Tuesday: Busywork
Friday: Reading & Learning

In Example A. The problem is that sometimes you need more time to get into things or you post-phone some tasks, because they are not important enough.

In Example B. The risk is that a missing day can cost you a week, before you come back to that part again.

Would love to hear any other thoughts on this!