2-weeks in Thailand or Tanzania & Zanzibar: Helppp Deciding!!

My fiancee and I are down to two places on our honeymoon and are having trouble deciding. We'd really appreciate your opinions and thoughts. I'll break down the itinerary for both. They are both around the same price

• Thailand: Early November or December (4 and 5 star hotels)
  • Bangkok 2-nights
  • Chiang Mai: 3 nights (elephants, cooking class, etc.)
  • Island destinations (going to choose 2 or 3 to wrap the trip): Khao Lak, Krabi, Koh Lanta: Here we'd do a lot of beaching, relaxing, and water activities
• Tanzania & Zanzibar (Mid September):
  • Day 1: Stay in Arusha Lodge near JRO
  • Day 2: Tarangire National Park Safari (Kudu Lodge)
  • Day 3: Drive to Central Serengeti (Olkerian Eco Camp): Hot air balloon, safari
  • Day 4: Move to Northern Serengeti (Angat Bologoja): Safar
  • Day 5: Go to Ngorongoro crater (Tortilis Ngorongoro Camp): Safari
  • Day6: Safari at Ngorongoro crater in the morning and transfer to Arusha Lodge,.
  • Day 7-12: Fly to Zanzibar, stay at (Tulia Zanzibar): Relax at hotel, Snorkeling, water activites.

Please let me know what you would recommend and which you'd go with. If you have any recommendations to the itinerary please let me know. Thank you in advance!!