ᐅ How to separate the garden area?

Hello everyone,
I would like to ask for your knowledge and ideas again.
You are basically my garden planners.

We have a green area of about 1200-1300sqm (12900-14000 sq ft).
I want to improve it a bit soon.
That means I want to separate part of it as a productive garden (fruit trees, fruit bushes, a small vegetable garden, and a compost pile; possibly some wooden fence panels will need to stay for a while) and the other part for living and playing for the children and us.
I estimate the productive garden part to be about 400sqm (4300 sq ft).

I have been thinking for a while about HOW to divide the garden, but none of my solutions satisfy me completely.

The boundary would need to be 17.80m (about 58 ft) (essentially the orange line):

- Wooden fence or metal fence? (wooden fences need to be painted)
- Hedge (but it has to be trimmed, and we already have enough hedges)
- Use fruit bushes (raspberry/red currant/blueberry) as a border? How would that look?
- An earth bank? But that probably means a lot of work again (we have a lot of oak leaves!)
- Something like raised beds—but they would also need to be planted. Then I wouldn’t need a bed in the productive garden anymore.
- Or simply no visible separation at all? But since we plan to have a dog someday, I think it would be nicer and more attractive to have some kind of boundary. Also, it would improve the appearance.

Hmm. I’m quite unsure. Maybe you have an opinion?
It shouldn’t cause much extra work.

Thanks for thinking about this,
Mery