The 'best' smelling of these is C. Goveniana, it has a little twist of lemon in it. The others will remind you of fresh clean air or a skunk according to you palate. Juniperus californica has beautiful gray-blue foliage and is perfect in a dry woodland garden as a single accent or as a windbreak. Juniperus communis is appropriate for a mountain garden. The leaves have an intense, unique fragrance reminiscent of the chaparral community.
Some people love it and some people hate it.
The flowers are showy and this would be another plant that would do well in a wild garden. The hummingbirds do visit it. This is the mint that is best to taste with the true mint fragrance. The flower clusters look like purple pom poms. The leaves have a strong minty fragrance and these plants would be great at the front of a flower border or along a path.