Also Feyenoord, the club whose hard-core fans have a history of less than ...tastefull chants.
'Alle joden aan het gas' ('All jews on gas') stands out as especially memorable.
"Jews", in that sentence, being code for Ajax fans.
Same tradition with Arsenal vs Tottenham... so yeah, why Liverpool and not Arsenal? Why Barca and not Atletico?
OL is the club in France that shites it money all over everything, so they belong on the list. Can't judge about the southron clubs, of course.
Most of it comes from choosing teams when I was in grade 4, based off a combination of:
a) FIFA Futbol Mundial club profiles
(Porto, Lazio; not that they were good profiles, just that they had profiles at all)
b) Teams that Andrew Mazuras, a school friend, didn't like
(Liverpool, Barca)
c) Teams that I played in FIFA '97
(OL, Bayern)
d) Teams who I liked the name of
(Hearts, Feyenoord)
Of the other three, Melbourne Victory is the home team, Rosario Central I saw live in Argentina in 2006, against San Lorenzo, and Magellanes cos the family who ran the hostel in Santiago had massive Magellanes flags all over the place.
I'm happy with my teams, even if they are an odd bunch, and I never actually follow anything about them.