A team who have won their country's top tier league, major secondary competition and the continental championship in the same year is a treble team. I've listed all UEFA treble teams. I can't really rank them because I haven't see most of it. But I think it's fair to say that Ajax and Barcelona are mentionable for some reason. They didn't just win, no. The spanish and dutch football also changed football forever. Rinus Michels invented "Total Football". Johan Cruyff invented Tiki Taka, while Pep Guardiola with Barcelona perfected it in the recent years.
1- AJAX of Cruijff 1972. 2- Barca 08-09 3- Bayern 12-13 4- Inter 09-10 5- ManU 99-00 6- Celtic 66-67 7- PSV 87-88 8? Let me remind you that Liverpool lost at Intercontinental cup to Botafogo of Zico