Use what you're comfortable with. A better way to phrase what I'm saying is this:

If I'm trying to teach some concept about some thing that doesn't need UI, I'm using a console application to reduce clutter and keep the focus on the concept.

But there are so many needs for CRUD apps in the world, WinForms has a ton of facilities for them. I can't talk about DataGridView without a Form. So when I get there, I'll go to the trouble of setting up a UI. And in that case, while it's "trouble" to explain what I did in the designer, the whole point of the 'lesson' will be that "trouble", so it's not worth complaining about.