A bad generalization, but, Quality. Often the budget live boards don't have the same specs (S/N crosstalk, etc) nor as good a grounding scheme as a studio board because the ambient noise in a live room overcomes the need for such better specs.
". I did read live boards EQ's and Pres are flat and bad for recording, but that was one post."
Yes, you can use this type of a board.
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