TSR2 had met virtually all of its design spec requirements before it was stabbed in the back by Mountbottom, then finally put to death by Harold Wislon's communists.
Whereas P1154 had yet to fly.
Although a bit of a pig to fly at low speed (but so was the Buccaneer), the TSR2 had vastly more promise than the P1154 which would have had immense design and development issues to overcome.