Visit both place once. They have thier own charm. Northeast is pure and organic and Ladakh have different adventure vibe. Its not you always want to go to one place. Try to visit one new place everytime.
Dear Shalin, for Leh Ladakh, just go through this. (i) Leh
1. Hall of Fame Museum 2. Namgyal Tsemo Monastery 3. Leh Palace 4. Zorawar Fort 5. Shanti Stupa ( Buddhist temple ) 6. Shey Palace ( Monastery ) 7. Thiksey ( Monastery ) 8. Hemis Gompa 9. Magnetic Hill 10. Gurudwara Pathar Sahib 11. Khardung La (ii) Nubra Valley
1. Diskit Gompa 2. Hunder Sand Dunes with Camel Safari 3. Turtuk Village 4. Tiger Camp 5. Charasa 6. Ensa Monastery (Gompa) 7. Yarab Tso Lake 8. Panamik Hot Spring (iii) Pangong Lake (iv) Changthang
1. Chushul 2. Hanle with Indian Astronomical Observatory 3. Tso Moriri Lake with wildlife 4. Puga Valley 5. Tso Kar Lake 6. Yaye Tso 7. Chumathang Hot Spring 8. Kiyari war memorial (v) Aryan Valley (vi) Leh to Kargil
1. Nimu village 2. Likir, Alchi, Lamayuru Monastery 3. Fotu La, Namika La 4. Mulbekh Monastery (vii) Suru Valley
1. Parkachik Glacier 2. Nun Kun mountain 3. Rangdum (viii) Zanskar Valley
1. Padum 2. Phuktal Gompa 3. Chadar Trek (ix) Hemis National Park
1. Stok kangri 2. National Park but Main Focus SNOW LEOPARD (x) Leh - Manali Road Trip
*** Leh --> Shey --> Thiksey --> Karu --> Upshi --> Rumtse --> Taglang La --> Debring --> More plains --> Pang --> Lachalung La --> Sarchu --> Suraj Tal --> Baralacha La --> Zing Zing Bar --> Darcha --> Jispa --> Kyelang --> Gondhla --> Khoksar --> Rohtang La --> Kothi --> Manali