I think you need to work out what sort of plants / look you want first as that dictates how you do the boarders.
Raised beds will generally* give a crisp edge. A more formal bed with exposed soil or mulch will give the same clean structure, but obviously on a flatter plane.
If you want something informal with flowers flopping out to the grass then I'd go for ground hight beds at slightly above grass height. You can cut the turf and turn it upside down and then put soil on top of that.
If you want something more structured then I'd go raised as it's less work to keep clean lines and add some height interest. Bear in mind that raised beds as you've drawn will make the garden look smaller than ground height beds.
*you can soften this to some extent with overhanging plants.
I think you need to work out what sort of plants / look you want first as that dictates how you do the boarders.
Raised beds will generally* give a crisp edge. A more formal bed with exposed soil or mulch will give the same clean structure, but obviously on a flatter plane.
If you want something informal with flowers flopping out to the grass then I'd go for ground hight beds at slightly above grass height. You can cut the turf and turn it upside down and then put soil on top of that.
If you want something more structured then I'd go raised as it's less work to keep clean lines and add some height interest. Bear in mind that raised beds as you've drawn will make the garden look smaller than ground height beds.
*you can soften this to some extent with overhanging plants.