Really don't know,
Like I think I mentioned on earlier posts, I bought a used M1991 Commander, and it already had one installed (the one that requires a hex screw driver/allen wrench to remove. I'm going to replace it for a stock guide rod, since I like to be able to field strip w/o tools, and I don't see the point for having one that didn't originally come with the pistol (if it ain't broke, don't fix it).
Now, if it was a competition piece, it might be a different story, I don't compete, so I don't know. I just don't see what the difference is between one and the other, just that it's not as easy to dissasemble.
Don't get me wrong, I have nothing against improving it by adding ambi safeties or better sights, but I have never had any problems with stock guide rods.
Maybe someone can explain their benefit,
Cowboy