Don't know too much about Argentine club soccer but I'll go with Boca Jrs. just for the hell of it.
top leagues imo in no particular order:
Serie A, La Liga, English Premier League, MLS, Bundesliga, 1Turkish League, Le Championat(ligue 1), the Eredivisie, Greek A Division and the Campeonato Brasileiro.

Honourable mentions go to: la Apertura, the Saudi, Iranian, Israeli/Palestinian leagues, and the K-League.