Everedge - what depth to buy?

[Cramlington567]

Planning to get some for this border.

Since the lawn is more or less level with the border my thoughts were that I don't need the deepest one. I understand the spikes are the same depth on all sizes.

In terms of stopping the lawn spreading into my border with 'runners' going underneath, would it be best to get the deeper one and push it down? Or should I just get the smaller or second smallest size which would suffice perhaps but just wondering if I could contain my lawn better with a deeper one.

Thanks

Also, less important but which colour do you think would look best.

Brown would blend in more with the earth and become invisible if that’s what you want. Mine is brown and it’s really not noticeable. There seems to be more choice as regards height since I bought mine and I can’t recall which size I had sorry.