HP doesn't have a "Dehradun", which means local netas have an incentive to invest in their zilla instead of hoarding cash and real estate in a major hub. Thus, Himachal benefited from a Pharma and Food Processing industrial policy in the 1990s-2000s that industrialized the rural area around Baddi and Una, and a lot of other smaller food processing and light manufacturing industries across lower Himachal.
Also, Uttarakhand has too few MLAs for the size of population. UK has 70 MLAs but 10 million people, but HP has 68 MLAs with 6.5 million people. This means UK MLAs are much more divorced from local panchayats compared to in HP.
There is a good case study about this at Harvard Business School [0]
[0] - https://www.hbs.edu/ris/Publication%20Files/Asian_Survey_550...
Trust me. You don't want that. Ussi najuwane nu khadi pata ni hege (Kangri but translate to your equivalent)