When to use CB background image, and when Default image block?

Hello,

I don’t understand, in which cases should I add it as a background image inside the Container Block?
Or when should I rather use the default image block?

I know, that when using the Container-Block (CB) I have more options regarding spacing, coloring etc. But images look “sharper” using the default image block and it frustrates me to see images via the CB looking bad.

I’d like to learn about typical use-cases about when to add an image via CB-Background-Image, or via default Image Block.

I also find it difficulot to understand, why an image added via CB is looking “blurry” compared to the image block. I have created a demo-site to illustrate the issue I have:

https://demo.macbay.org/bbgp/

I find the current documentation lacking a good explanation about how to work with images properly and really hope, that you can guide me sustainably.

I don’t like video-tutorials, because they require me way too much time for learning, since I can read faster compared to my listening abilities.

Thank you in advance and kind regards,
Sascha