Sending both through the bank will get you paid faster.
SBTPG will take our fee from whichever refund comes first (federal / state)
If State Refund is too small you can't do it
Also keep in mind
Some of your clients will be expecting state refund and it could be smaller because SBTPG took our fee or some of our fee from the State and wiped out their refund.
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If you don't want that to happen
Send the federal through the bank
⁉️Do regular efile & direct deposit for the state if you don't want the tax bank to touch it