I have been living in Bangkok on and off for the past 10 years but spent an aggregate of about 3 months in the Hong Kong area.
For sure, HK crushes BKK on the biking/hiking aspect as there are a ton of trails in the outlying hills compared with BKK's mile+ loop in Lumphini Park.
I don't hit the bars but am never bored in Bangkok. Overall, IMO, Thai is a more fun and friendly culture than the Cantonese and it is easier to find a quality breeding mate in BKK, which I attribute to the dearth of "good guys" in Thailand. Again, IMO.
Good eats of almost all varieties in both places, Thailand just much less expensive.
If weather is a concern, BKK is hot even in December whilst HK is sweater worthy in the winter.
Seriously, both are great cities and the wife and I had pondered a move to HK a few years back, just never got around to it.
If looking for a Manhattan feel, then i would say Hong Kong is more like it.
If you want a more layed back, funky, and liberal place, then I would go with Bangkok.
Wherever you choose, may you enjoy it
