It all depends on what the map tune is doing. I'm sure some of the big differences are between I'd you are changing values on existing maps vs modifying the entire map structure. I.e. fuel maps are based on load...obd flashing probably allows them to tweak the map as it is, while a bench flash can help add rows and columns to help expand the map for things like larger turbos.
Again speculating, but that's what I have seen on other platforms.
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