That sort of question is highly personal. I've heard many, many people espousing the virtues of some strain of weed or other (eg claiming it helps you think and doesn't make you fall asleep so much) but I've never actually found one that doesn't primarily make me sleepy. I do have access to an enormous variety to try (and I've definitely done my due diligence, so to speak). This has led me to believe that for some people, some strains work differently than for others. This meshes well with my observation that everyone seems to have different recommendations.