When I go to download the Diablo III game client from Battle.net, I have a choice between three different clients if I intend to play in English: English (US), English (EU), and English (SG).
I know that it's not determining which servers I can access, because there's a "Global Play" concept, which means everyone can play on whichever server they want.
I know the client is not used to determine the "home" region either, because the "Global Play" page also says that:
players will create characters and play in their "home" region, which is determined by where they live (specifically, the country of residence registered to their Battle.net account)
So, what is the difference between the clients? Which should I install?