Amazing pics! While busy Hanoi looks to have a kind of comfy vibe - very appealing to me. Bangkok looks kinda hectic and impersonal in comparison. No idea if this is the case in reality though.
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I agree with Niwell that Hanoi generally looks like the way cooler city. Bangkok doesn't appeal to me much, but it's still interesting to see. I'd be curious to know what you thought of each place?