Simple really; which Borderlands 2 manufacturer is your favourite for each weapon type? I'll start:
Pistols: Vladof - Sure they're not the most powerful or the most accurate, but the high fire rate, and usually higher damage than other Vladof weapons means Vladof pistols have a ridiculously high DPS. Not only that but they're just fun as hell to use. Nothing says 'joy puke your face off' quite like Gunzerking with a Vladof pistol and a Maliwan slag weapon
SMGs: Tediore - Tediore SMGs hold their own against other SMGs for damage, firing speed and accuracy, but what tips it over the edge is Tediore's reload mechanism. Tediore SMGs are by far the easiest Tediore class for me to throw at enemies and they're hella useful in desperate situations like Fight For Your Life.
Shotguns: Hyperion - A fully-automatic shotgun that gets more accurate as you fire? Don't mind if I do!
Assault Rifles: Vladof - I don't always use assault rifles, but when I do I use the manufacturer with the high DPS.
Sniper Rifles: Jakobs - DAT CRITICAL HIT DAMAGE.
Rocket Launchers: Bandit - I almost never use rocket launchers, but the three projectile shot is pretty good, especially at closer range. Good for splash damage.
Grenades: Hyperion - Singularity grenades are just really damn effective, what can I say?
Pistols: Vladof - Sure they're not the most powerful or the most accurate, but the high fire rate, and usually higher damage than other Vladof weapons means Vladof pistols have a ridiculously high DPS. Not only that but they're just fun as hell to use. Nothing says 'joy puke your face off' quite like Gunzerking with a Vladof pistol and a Maliwan slag weapon
SMGs: Tediore - Tediore SMGs hold their own against other SMGs for damage, firing speed and accuracy, but what tips it over the edge is Tediore's reload mechanism. Tediore SMGs are by far the easiest Tediore class for me to throw at enemies and they're hella useful in desperate situations like Fight For Your Life.
Shotguns: Hyperion - A fully-automatic shotgun that gets more accurate as you fire? Don't mind if I do!
Assault Rifles: Vladof - I don't always use assault rifles, but when I do I use the manufacturer with the high DPS.
Sniper Rifles: Jakobs - DAT CRITICAL HIT DAMAGE.
Rocket Launchers: Bandit - I almost never use rocket launchers, but the three projectile shot is pretty good, especially at closer range. Good for splash damage.
Grenades: Hyperion - Singularity grenades are just really damn effective, what can I say?