At my former agency we installed the straight grip (common on the 4006) for our 5903's for shooters with smaller hands, and they felt it worked better for them.
FWIW, some care must be exercised when installing factory grips, as sometimes an inattentive (or unfamiliar) person can tweak and damage the sideplate during the installation process.
What can potentially happen is the upper L/F corner of the new grip may catch/snag under the bottom edge of the sideplate, and pressure exerted to push the grip up into position may cause the bottom rear 'prong' of the sideplate (around the headed sear pin) to either bend or snap off. This can allow the sideplate to shift and not remain sufficiently stationary for the slide stop lever's plunger to function properly.
Also, sometimes someone may not notice the rear of the backstrap isn't sufficiently pushed forward, and this can cause the manual safety/decocking lever to hit against the top of the grip and interfere with the lever movement. Usually, grasping the grip (shooting grip) and squeezing it will move a slightly out-of-position grip forward into place (presuming no other problem has occurred, like one of the grip's hooks - fitting against the forward edge of each grip frame window - hasn't been positioned incorrectly).
Decocking lever movement blocked because the grip isn't properly position on the frame (notice the top of the backstrap not fully forward under the frame tang?):
Proper decocking lever movement with properly installed grip:
Old factory instructions for removing and replacing factory grips.
Notice the warning in Step 3 of the last group of instructions.
