Sourdough sandwich bread, oil or no?

I have been working on fresh milled, whole grain sourdough bread. I have tried it with and without oil and wanted a side by side bake off. This is the results.

For the basic recipe with white flour
https://www.youtube.com/watch?v=rm3S_Aj11Uw

Music
Track: Chill Acoustic
Music provided by Oak Studios
https://youtu.be/s0T1Te_33C0