The ring design was popular back before the wallbreaker update (my base looked like that up until the wallbreaker update several months ago). Now that the wallbreakers are smarter, the ring design only works against low level attackers who don't know how to properly deploy wallbreakers.
If you really want to compare defenses, my last defenses were 24%, 0%, 16%, 24%, 0%, 3%, 24%, 16%, 19%, 16%, 8%, 13%, 23%, etc, with my hybrid layout. The 0%s were DE lightning.

