Oregano is a very promiscious plant, so it easily crosses within the genus. Sorting out which ones are more delicious and which have beautiful flowers can be daunting! Greek Mountain Oregano is a very delicious variety that has a bit larger leaves, dark green and slightly wavy, with a strong flavor similar to regular Greek oregano but just a hint more softness. It is a bit prettier also, and is very nice in containers.
Keep on the dry side, and prune to keep tidy. Full sun is best.