Everyone is different so you may need to experiment with a few strains before you find the one that works right for you.
I have noticed that Indica strains make me feel relaxed but also sleepy. Personal Favorite is Grand Daddy Purple.
The strains that make me the most relaxed also have traces of CBD in it such as Platinum Purple.
I would even suggest trying a strain that is 1:1 ratio of THC to CBD such as the strain Pennywise for example.