I like their high interest rate. But they don't update how much money you're making until the end of the period, every month. With ING, you can log in every single day and see your interest grow day in day out.

The HSBC website also looks like it was built years ago by a beginner in web design. There's also many features but it's complicated and ING's site is much easier to navigate and the sign-up process is much better.

Ultimately what it all boils down to is the money, so I'll stick with HSBC for the high rates, for now at least.