It depends on what you’re looking for!
Across the board, people tend to have these responses when broken down by speed of strain:
Fast strains are normally the best for productivity, pro-social mindset, energy and encouraging a vibrant lifestyle (Hyper, Rockstar and Red Hot Hippo).
Slow strains are normally the best for encouraging a sense of well-being, temporary reduction in general discomfort and restful sleep. (Magic, Red Dragon Bali, Slow-Mo).
Moderate strains provide a balanced effect between Slow and Fast strains (Ghost, HH1, Sassy).