Weapon prediction:
Aerospray: loses value. Unless unless it's RG, but trying to fill that up for Inkstrike instead of holding of enemies seems like the wrong game plan.
Inkbrush:: Again, the only real use is the Inkstrike.
Roller: A mass 1HKO weapon could clear the tower when it's in enemy control. The Krak-on is only useful for the beacon, as it will allow your team to back you up on the tower (And yes, you will be moved to the Beacons location on the tower and not where it last was when you jumped to it, if the trucks in Mackerel and the Salt crane are any indications). The Kraken seems bad in this mode, so its (and my) reign will end. Standard roller seems better because suction bombs are pure area denial.
Squelcher: Range is king when attacking and defending. Any version will likely do fine.
Jr: Either you're in full invulnerability on the tower, or you will slow down the enemies using Disruptors. Anyway, keep firing at these guys even with Bubbles up, because you can always push 'em.
Blasters (all types): Fire at the tower, never stand on it. You have no real way to defend yourself when standing on it.
Chargers: Always a great choice, because your trying to keep enemies of them. You should always take them out or distract them to avoid a bad time.
Dynamo: Scare 'em!
Nozzle, 52, 96, Pro: ??? (Haven't really used them much)
Splattershot: An average weapon that covers all bases to get to the tower.
Splash: Three words: Suction. Bomb. Rush.