Phnom Penh vs Hanoi

How do Phnom Penh and Hanoi compare?

The Indochina-capitals decision — both French-colonial-bones, both Mekong-watershed, completely different national moods. Hanoi is the 1000-year-old north Vietnamese capital — Old Quarter's 36 guild streets where each lane still sells one thing (Hang Bac for silver, Hang Gai for silk), Hoan Kiem Lake's red bridge to Ngoc Son temple, $1.50 banh mi at Banh Mi 25, $2 bun cha (the dish Obama ate with Bourdain) on Le Van Huu, egg coffee invented at Cafe Giang in 1946, and the chaotic motorbike ballet of 8 million scooters. Phnom Penh is Cambodia's recovering capital on the Tonle Sap-Mekong confluence — the silver-pagoda Royal Palace, the harrowing Tuol Sleng (S-21) genocide museum and Choeung Ek killing fields outside town, the riverside Sisowath Quay sunset bars, the Russian Market for $5 silk scarves, and a French colonial grid quietly being eaten by Chinese-funded high-rises.

Hanoi runs $20 hostel / $50 mid / $135 luxe, safety around 75. Phnom Penh runs $20 hostel / $55 mid / $150 luxe, safety around 65 — bag-snatch by passing motos is the real and persistent issue, especially after dark on the riverside. Beer is comically cheap in both — Hanoi bia hoi at 25 cents a glass, Phnom Penh's Angkor draft at $0.75 — but US-dollar-denominated Cambodia is 20% pricier on hotels and tours than dong-denominated Vietnam. Climate divides — Hanoi has four real seasons including a 12°C damp January and 38°C July, Phnom Penh is uniformly hot at 28-35°C with wet-and-dry instead of cold-and-hot. Cultural depth tilts to Hanoi for living history and food obsession; Phnom Penh demands respect for its trauma but rewards with Mekong sunsets.

Hanoi's window is October-November or March-April (skip the cold drizzle of Jan-Feb and the punishing heat of June-August). Phnom Penh is best November-February in dry season, 28°C and breezy. Pro tip: in Hanoi cross the road by walking slowly and predictably — scooters flow around you, but stopping is what gets you hit; in Phnom Penh keep your bag on the building-side shoulder, never the curb-side, and don't ride tuk-tuks with your phone in your hand. Pick Hanoi for Old Quarter chaos, $2 bun cha, and the densest food scene in Vietnam. Pick Phnom Penh for confronting the Khmer Rouge story, riverside sundowners, and a still-rough-edged capital that costs less to fly into than Siem Reap.