I'm not sure if it's a pissing contest. The Tirpitz was hit by two bombs in the final raid, the one that did the 'damage' no one will ever know. 9 Squadron seem to think that they have comeuppance based on one authors claim..
Despite both squadrons claiming that it was their bombs that actually sank the Tirpitz, it was the Tallboy bomb, dropped from a No. 9 Sqn Lancaster WS-Y (LM220) piloted by Flying Officer Dougie Tweddle that is attributed to the sinking of the warship. F/O Tweddle was awarded the Distinguished Flying Cross for his part in the operations against the Tirpitz.
but, as I've said, two bombs hit it
A force of 32 Lancasters from Nos. 9 and 617 Squadrons dropped 29 Tallboys on the ship, with two direct hits and one near miss. Several other bombs landed within the anti-torpedo net barrier and caused significant cratering of the seabed; this removed much of the sandbank that had been constructed to prevent the ship from capsizing. One bomb penetrated the ship's deck between turrets Anton and Bruno but failed to explode. A second hit amidships between the aircraft catapult and the funnel and caused severe damage. A very large hole was blown into the ship's side and bottom; the entire section of belt armour abreast of the bomb hit was completely destroyed. A third bomb may have struck the ship on the port side of turret Caesar.
No one will ever know