How much will you either (a) sell the business for, or (b) earn from the business when you stop working?
Also, how old are you now, and how old when you retire?
Obviously, there are more factors, but if you feel very comfortable about your cash situation when you retire at [let's say] 50, then why not let it grow another 9.5 years in the Roth?
What are the assets that will fund retirement?