For me, it's The Winner Takes It All

Take A Chance On Me is my fave.

Kinda shocked at 'Mamma Mia' being the least popular pick here! (At the time I voted the other day I was the only person who had voted for 'Super Trouper' but I see 2 others joined me now - honestly I don't have a strong opinion on these though as there are only a few ABBA songs I really like and none of them got to #1 lol, 'The Winner Takes It All' could easily have got my vote too so that's a satisfactory enough leader in this poll).

Definitely The Winner Takes It All, which is narrowly my favourite songs of theirs too ahead of Lay All Your Love On Me and When All Is Said And Done.

I'm a huge fan generally so this is really tough... my Top 3 are Knowing Me Knowing You, The Winner Takes it All and The Name of the Game.

 

I really think The Name of the Game is an underrated gem with such a beautiful and interesting structure - it's surprising that it went to #1 at all in a way as it isn't catchy like most of the others.