Which of these would be a better choice for cqb out of a ~8-9 inch barrel? For example, a mp5a4/ump9 firing 9mm rounds vs a g36c firing 5.56 NATO's. Plz consider terminal ballistics, accuracy, recoil, etc. Disregard noise, effectiveness w/ silencer, and cost/availability of ammo. I was wondering about the pros of a 9mm smg with a ~9 in. barrel vs. a g36c (also 9 in. barrel ) firing 5.56 rounds.