After having gone through a couple different vest and chest carrier options here is my advice. First figure out what you are going to use the vest for, military, field shooting trips, competition, CQB training, SHTF etc... Layout all of the gear that you plan to carry in the vest given your needs and then ask yourself if you are really going to carry all that gear for your planned usage as opposed to more ammo or water. I found that many of those extra pockets filled with stuff get in the way of quick mag changes, access to backup weapons (a vest might cover up your sidearm and you may need a different holster setup like a drop leg), limit me in positional shooting and for my uses (mainly CQB training) a lighter more simple vest or chest carrier is what works best for me. Some of my training partners find chest rigs put too much weight on their front and it hurts their back. Vest tend to distribute load better. Are you going to wear body armor? If so, then make sure you get a compatible rig. A MOLLE type unit offers a great deal of flexibilty. My next purchase will be
this with a few additional GP pockets. If you plan on riding in a vehicle while wearing your rig, I have found that chest carriers and a good backpack is a good combo because you can take off the pack but you stiff have first line gear available on the chest rig. Here in Arizona, vest can get hot, so a well ventelated vest would be key. If money is no object, then I would get several different less expensive rigs to test out in the field or in training see which option works best for you. You can always sell the rigs that did not work out on the EE board.