Well if you understand the disadvantages of armor then let us know what you are looking for.
When Im overseas I use a Point Blank Nato Front Opening. I prefer this style vest because it can be donned and doffed fast. Since its front opening I usually open the front to vent it out during off time. It has wrap around side protection and a collar. If you could only have one tactical vest thats what I would get. You wont be able to put on a side opening vest or that pig plate carrier with such speed.