Presumably, one has to be slightly faster, as:
If UnitID.Image != <empty string>
Then GetArtwork(UnitID.Image)
Else GetArtwork(UnitID)
In which case, using Image= would be more efficient (by a few instructions)
Or the other way around.
Maybe not worth the hassle, but one still has to be more efficient than the other, even if it is only by one instruction.
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