Private banking is a special service to ease the transactions of high networth people..
Each banks has a minimum amount you need to have in your account to be eligible for private banking services..

rstusa, I think that Vantage Account doesn't mean that you're eligible for private banking..
That account is commercial banking, whereby you register under your company name, not personal account..
HSBC Premier Account sounds more like a private banking, with focus on the priority of the client..
That SG Asia one is not a normal bank, it's more into investment banking where you can go through them to diversify your portfolio..

The difference with private banking is you can do your transactions in a different environment, with a red carpet treatment..
There's not much difference, just the service..
Private/Priority banking doesn't mean it's a different bank..
It's the same bank, but cater for different standard of clients..