I have to admit, that although I’m a big Sig Sauer fan, I find the factory grips they come in to be below anything I would actually call a grip, they just feel too slippery to me and a handgun or rifle grip should be as tight in the palm of your hand as a pair of baseball gloves.   Everyone’s hand size is going to be different so there is nothing wrong with accessorizing each individual to the firearm, which is why so many manufacturers are making handguns with different back straps.   The really differences between most of the Hogue Grips I have on AR15s, shotguns and handguns are the ones with finger grooves and the ones without.   You do have to be careful about the finger grooved grips because they will force your hand to expand to some degree which can cause finger cramping if you are at the range for long periods of time.   This is something you can easily over come but it just a heads up that many competition shooters are very aware of and sometimes they shy away from them.

One of the hottest replacement grips for many AR15 owners are the Magpul MOE Plus and the Hogue AR15 grips.   There is a beaver tail Hogue Grip that is another preference because for many, they want to get their hand up as high on the grip to be able to be proficient with the firearm.   As a firearm instructor I have witnessed new shooters greatly improve as soon as a rifle stock or hogue grips are put adjusted properly to their hand size.   Another thing you do have to be careful about is when you change the grips on your sidearm, trying to reach magazines releases and slide stops can change and I  have had to modify some of my firearms because of this.   1911 handguns, Glocks and Sig 228 pistols all can be improved with the proper grips.