Never really got the 'league is more important' thing. Of course it is in many respects, but victory at Arsenal or Oldham? Arsenal every time. People will always remember the OT game. Anyone remember how we got on a few days later in the 'much more important' league game? Nah, I doubt it.
If I think back to my fondest City memories, I think 87, Old Trafford, league cup 1/4 final against Sunderland, that epic win at Villa, the cup win at Anfield, 3-0 FA Cup tie at Leicester - these are the games we remember most. Yes, there are plenty of league games that stay in the memory, but when a game like this comes along you have to take the opportunity to try and create some new lasting memories.
Victory as a 3 tier team at Arsenal or 3 points at Oldham - which one would we be telling our grandkids about in years to come?