They're both great... Just a little difference that I saw was Himachal is more into Hippie stuff while Uttarakhand is not into that.. Plus Uttarakhand has this peaceful vibe... I don't know if anyone agrees me on that... Do you?
I donot agree completely.manali is still a hit but kasol has come to the level of manali and became an instant hit for new generation travellers.
Same thing happen with shimla also.it has became a 2 night vacation spot from 5-6 days.
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Hu Harsha, just saw this question of yours, and thought of addressing. I am a full time traveller and a published photographer. So, for me, traveling is part of life. Even I am not traveling or will not travel for a while. the situation is still bad, and a young person travelling may actually put others to risk. Once it gets better, may be after a few months, I will start traveling with a road trip. stay safe 👍