Reasons for change
It’s hard to know if a configuration is best for you. I recently got a phone call from a shooter that sounded like he was new to the AR15 family. He was asking about which rifle stock configuration was best and then I asked him what his LOP or length of pull was and he had no idea. The reasons for adjustable stocks is because each operator issued a Carbine has a different arm length. I’ve punched myself in the nose with rifles and shotguns that were too short for me and modified several of my M1A rifles to fit my comfort. There are also other reasons for having stock modifications. If you are wearing a heavy winter coat or body armor you will want to shorten your stock. Next time you are at a gun shop or a shooting range, ask other shooters if you can hold there gun and see how it feels. Check the gun stock manufacturer and do some research.
There are different levels of weaponry and modifications depending on the deployment. Vltor rifle stocks were designed for Marine Corps and Special forces. The design of the updgrades to your AR15 are for improved ergonomics and for increase storage capabilities. The notion of storing gun parts or batteries on your firearms is debateable, but there are plenty of people that like this reasoning. The VLTOR rifle stocks also have a cheekweld and buttstock design that will increase your lock on to target.
You might want to think about collapseable stocks or folding stocks. Guns can take up a lot of space depending on the optics and accessories you put on them. I’ve seen plenty of my friends go from 12 or 18 rifle safes to full size gun safes just because of the optics they had on rifles. One thing they never advertise when you are shopping for a gun safe is what kind of rifles it will hold. Cramming your guns in will only cause damage and make getting guns in and out a headache. Instead of worrying about having to find a new gun safe, you might want to think about spending a few hundred bucks on changing the stocks of your military style weapons to something that can fold or collapse.