The only difference between a premiere account and a business account is the display of the business name instead of the account owner's name wherever it's used. It's significant from a legal/accounting standpoint, not a feature standpoint.
If you have a legal business entity, and you're attributing income and expenses going through this account to that business, you would probably want to use a business account. If you had an LLC for example, and were selling with a Premiere account in your name, that may be evidence the buyer could use to go after you personally in a lawsuit, rather than the business.
If you don't have a legal business entity, or at least a DBA filed, then I wouldn't recommend making up a name and switching the account type.