✔ 最佳答案
1. It depends on what exactly your purpose is.
For example, if you have plans using USD (like going to the U.S.), it is not a bad idea at all.
Other than that, it depends on how much difference in interest.
2. The good news is HKD is linked with USD. So the exchange rate is stable. So you will not suffer a big loss in exchange in case of any problem. Beside, in case you are not yet ready to exchange USD into HKD, you can put the USD into a saving account.
The bad news is the difference in interest among any currencies is not significant. USD, HKD, etc. will not make a difference that your money is losing value due to inflation. This makes no point of making any changes.