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?
Yes, HP is more commercialized now.. I went to Chopta in UK in 2018, they still didn't have proper hotels and electricity. Everything was solar at that time. And for instance, Kedarnath movie was shot there on the Tungnath Trek and barely anyone knows that.. 🖐🏻
Please visit Uttrakhand after lockdown and compare yourself. Hope then I will get my answer from you soon. Also, Uttrakhand is very less explored but it have more and more beauty to experience. It would be much better if you can discuss about UK before visiting. Thanks Neha.