They're both easy to grow and can be used year round. Except in an extreme winter, they look better in the fall and winter than in mid-summer when the growth begins to slow. Oregano is the familiar herb in pizzas and one plant would make a lot of pizzas. Spearmint is one of the most popular and the easiest to grow. Peppermint is more difficult to grow.
All mints appreciate moisture and do best where they get afternoon shade.
A good place to plant spearmint is at the base of a downspout. The fragrance is rather strong but rosemary is typically used with many meat dishes, especially chicken. One good idea is to use a cut sprig of rosemary to dip into barbecue sauce and then brush it on chicken. This is a sampling of the many herbs that can be grown in this area. Parsley, chervil and chives are best planted in the fall for winter growth.