Plans and comparisons
Two kinds of thing here. A worked plan for one city, day by day, so you are not building an itinerary from nothing. And an honest comparison of two places women weigh up against each other before they book.
If you know where you are going
Bangkok in 3 days
Silom, Sukhumvit, Thonglor and Ekkamai, Rattanakosin (Old City) and Ari
Bali in 7 days
Ubud, Canggu, Seminyak, Sanur and Amed
Chiang Mai in 3 days
Old City, Nimman, Riverside, Santitham and Chang Klan
Ho Chi Minh City in 3 days
District 1, District 3, Binh Thanh District, District 4 and District 7 (Phu My Hung)
Hanoi in 3 days
Old Quarter, Hoan Kiem, Tay Ho (West Lake), Ba Dinh and Hoan Kiem South (French Quarter area)
Siem Reap in 2 days
Old Market (Psah Chas), Wat Bo, Svay Dangkum, Sala Kamreuk and Kandaek / Banteay Chhmar Road
Singapore in 3 days
Chinatown, Kampong Glam, Little India, Tiong Bahru and Marina Bay
Kuala Lumpur in 2 days
Bukit Bintang, KLCC, Bangsar, Chow Kit and Brickfields (Little India)
Hoi An in 2 days
Ancient Town, An Bang Beach, Cam Nam Island, Cua Dai Beach Area and Cam Chau
Phuket in 3 days
Phuket Old Town, Patong, Kata and Karon, Kamala and Rawai and Nai Harn
If you are still deciding
The same four things for both sides: where you would spend your time, how you get around, when to go, and who each one suits.
Bali or Thailand
Bali is one destination. Thailand is a country with 7 cities in the guide, so this is a question about how much you want to move.
Bangkok or Chiang Mai
Both are in Thailand, and they attract different trips for different reasons.
Bali or Phuket
Bali sits in Indonesia, Phuket in Thailand.
Hanoi or Ho Chi Minh City
Both are in Vietnam, and they attract different trips for different reasons.
Bangkok or Ho Chi Minh City
Bangkok sits in Thailand, Ho Chi Minh City in Vietnam.
Chiang Mai or Da Nang
Chiang Mai sits in Thailand, Da Nang in Vietnam.
Siargao or Bali
Siargao sits in Philippines, Bali in Indonesia.
Siem Reap or Luang Prabang
Siem Reap sits in Cambodia, Luang Prabang in Laos.
Singapore or Bangkok
Singapore sits in Singapore, Bangkok in Thailand.
Hoi An or Da Nang
Both are in Vietnam, and they attract different trips for different reasons.