Hey Sirish, It is tough to say which is best one. But if your friend is a beginner in trekking then choose easy one - Kedarkantha trek. If he has some experience then choose new, less crowded winter trek — Brahmatal trek. Happy traveling!!!
Har ki doon- Har Ki Doon Trek in Uttarkashi, best trekking place in a beautiful meadow in Uttaranchal. Its a cradle shaped hanging valley within a height of 3566 meters above the sea level. In the month of October to March the valley is covered by the snow. It’s a beautiful place for trekking that no one can imagine so if you are thinking to plan a trek then you must visit this beautiful place.