Choose an appropriate record source for gallery items

For this video, I compared speed and usability for three options.
Using a collection for the items in a gallery.
Using a named formula for the items in a gallery.
Using the source table directly for the items in a gallery.

I came to a somewhat unexpected conclusion. In this video I offer some guidelines to help you choose between Collections, Named Formulas and Tables for Gallery Items.

Let me know in the comments if you agree or disagree.

This is a companion video to "Load 300,000 Records into a PowerApps Application?"

Links to downloads:
https://www.gpcdata.com/downloads/Employees2K7.zip
https://www.gpcdata.com/downloads/Employeesbacpac.zip