Idk, there is a good mix of good and bad guns. But i'd pick ones that have Kraken or Killer Wail. Whatever is good to you is most likely a good weapon.

my opinion would be the hero shot, if it was design, but it woulf be the tentact splattershot cause of inkzooka and suction bombs

Luna Blaster with Stealth Jump and Quick Respawn

Custom Dual Squelcher is the best in my opinion.