The difference is that between cocked and locked, or decocked and long first pull carry. Which do you prefer?
Note that you can't convert one into the other, as the holes in the frames are not in the same positions. So, my SP-01 can't be made into a Tactical, and my P-01 can't be converted to a safety.
In other words, figure out which you like before you buy, because you can't change it to the other mode once you've bought it.
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