From all I've read, the circle crossing is a marketing gimmick for tour companies. Every expert post I've read anywhere says there's nothing inherently better about the scenery or wildlife if you happen to cross the circle versus don't. On the other hand, if a trip marketed as a circle crossing gives you more days of landings overall, then that's a good thing and worth the money.

In my personal list of "check the boxes," I thought a continental landing was a cool gimmick to say I did but I couldn't have cared less about the circle crossing.