Hi Blkmane,
Regular Sage is more stimulating. It encourages blood circulation more than the Clary Sage. On the scalp it will increase blood flow to the surface of the skin more so than the Clary, and should not be used by persons whom are pregnant, have high blood pressure or are prone to seizures.
Clary Sage should be used with care also, but it's properties are less stimulating. What makes it good for hair/scalp is that it tends to regulate secretions and oils. It normalizes the scalp. When diluted WELL with carrier oil, it makes for a great scalp massage oil because it has properties that tends to relax the nervous system. It's very "calming".
Dilute both of these bad boys well with carrier oil (or add them to your shampoo/conditioner sparingly). As far as hair growth, it's the Sage that is said to stimulate more growth.
Hope this helps.
Pallas