well it all depends on your mind set :) both of the versions are the same..
and have the same qualities..but nevertheless people these days, still tend to have that negative view, when they see a phone which says made in china. they tend to think its fake, blah blah blahhh..but to help you with ur question...the phones which are made in either china or vietnam are the same and carry the same qualities...but if you feel better looking at a label which says made in vietnam rather that china, go for the vietnam one :)...but one major dis-advantage..sometimes even the store which is selling the phone will not know whether the phone is manufactured in china or vietnam, until he breaks the seal and checks the phone..but in order for them to break the seal and check, we will have to confirm that we will be buying that phone..or else, once the seal is broken they will not be able to sell it to a different customer..

regards