Help deciding which calendar design is more informative [on hold]

I have a logging application, where users check-in when they arrive, and the manager gets a full report at the end of the month.

I am in the midst of designing a monthly view for the manager, and instead of him needing to click each day to see how many people arrived, I am trying to aggregate the data, and show him a colorful calendar.

The examples here are just a prototype, and the final result would include gray for weekends and holidays, and wouldn't show anything on days in the future.

Can someone here help me decide which is the more informative way to do this?

Option 1

Option 2