1. It is easier to transfer funds to custody. It doesn't matter to open another Shenzhen account in a new brokerage firm. The account number is the same.

2. The transfer of funds is more troublesome. It's easy for brokers to handle, but it's more troublesome when they get to the bank. Some banks don't do it at all, or never do it at all.

Generally, the commission of small-scale brokers is relatively low, so just find a phone call online.