South/Southeast Asia itinerary - feedback kindly requested

Hello! Second post of the day; different question:

I am preparing for a 10-month trip through India, Nepal, and SE Asia. I'm looking for feedback on my general game plan. I have two potential itineraries, and am wondering:

1) Which route is better? 2) Any suggestions for places I haven't considered? 3) Any general critiques or suggestions?

Two of my priorities/travel interests are nature/hiking/trekking and Buddhist culture/spirituality. I also love Indian classical music.

ITINERARY A:

August - Ladakh

September - Himachal Pradesh (Manali, Dharamshala), Rishikesh/Haridwar

October - Kathmandu/Lalitpur, then a major trek the last two weeks (most likely the Annapurna Circuit Trek)

November - Pokhara, rest/chill/recover for a bit, back to Kathmandu

December - Varanasi, Kolkata (?)

January - Thailand (I'll be staying with a Thai friend who will basically be my tour guide, so this will be relatively relaxing and a break from having to plan things)

February - Laos, Vietnam

March - Vietnam, Cambodia

April/May - leaving it open for now; maybe Malaysia, Indonesia, Phillipines, or maybe go back & spend more time somewhere I enjoyed. Maybe even on to Japan if I have enough money left.

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ITINERARY B (so I can spend more time in India and see more of its diversity; even this is just scratching the surface)

August - Ladakh

September - Himachal Pradesh

October - Rajasthan

November - Uttarakhand (open to suggestions; haven't researched this as much)

December - Varanasi, Kolkata

Jan - Mar - Thailand/SE Asia

April - May - Nepal, including Annapurna trek

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Thank you for any feedback and suggestions!