You can make mayonnaise with relative ease at home using a blender or food processor. If you can figure out the name of the specific type of mayonnaise, it would likely be easier to make it from scratch than finding it ready-made at the store.
I’m making a few assumptions here ofc, but the main downside that comes to mind is how long it’d keep for, as you wouldn’t have much if any preservatives in the homemade product, though can’t say I’m experienced with that at all to properly comment.
Okay, but which one is easier for diagrams?
I’d say use the left for diagrams, and the right for reference as to how things look on the inside.