My favourite Fellini films are La Strada and Il Bidone but Il Vitelloni, La Dolce Vita, Ginger e Fred, 8 1/2, are worth watching.
Bergman's bests in my opinion are Cries and Whispers and Autumn Sonata but Wild Strawberries and the Seventh Seal are also worth watching.
Those are the only fellini and bergman films i have seen so I'm eager to hear of other films by them which are worth watching.