There are a few difference between HK and TW. I'll just state the goods.
HK=S rank release fast
TW= Game version update fastest, Gs can be used to buy lvl protector and draw event machines. The price of the Plan Mix here is relatively cheaper compared to the HK version, the price here is 39000g.

So strictly speaknig, the only advantage playing in HK is that they have more S ranks. That is why i chose the Taiwan version.
So it is up to you which kind of a advantage you want. BTW i have 17  S ranks now and will still grow 

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Added on November 25, 2010, 12:24 pmATTENTION TO ALL PLAYERS

Now wasabii is going strict now. DONT go to or open jump123 room or whatsoever unless you wan to be banned. There is alot of people getting banned from entering jump123 room now because the GM of this game is on the move. Who ever he sees in those rooms will be banned. I feel so lucky now that due to homework I havent been to those jump123 rooms for quite a while.

Basically 80% communication are done in chinese, which I notice in mission channel. Alot cant even understand some basic english. Before I stopped, I notice more and more players are abusing "bugs" which usually cause my client to crash 90% of the time. Honestly bit fed up with it. But the good thing of this sdgo is I can stop and resume any time I like, as it wont interrupt my progress.