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system
will adr owner enjoy same benefit as common shares holders
user
i would say you should invest in the market that is more convenient for you, bearing in mind that if you buy adrs you may have some things to keep an eye on depending on certain events as mentioned by duffbeer703. so, if you are investing with an account in the u.s., go with the adrs as that will avoid some currency conversion hassles and possible exchange rate issues.  i am not certain, but i have a feeling that would also make it easier for you to keep the taxman happy.
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