I went for a pistol build over an SMG because I think having the mag in the handle makes it for a more unique looking gun.
I don't plan on using it for big games as i would just be handicapping myself but for games that limit to single fire and short bursts i found that running this with 2x spare mags gives me more than enough ammunition.
Also, with the fittings being extremely lightweight i found that the mags weigh more than the gun itself and having the stock helps me gain line of sight a lot faster.
It's all personal preference at the end of the day.