As an Australian that has tried both, it was a lot easier to sound English than it is for me to sound French. I can almost pull off a decent English accent these days - enough so that I'm not identified as Australian in a short conversation. In French, after 10 years of living in the country, my accent is picked after oh, around about one syllable I think. Maybe two syllables... And yet I'm perfectly fluent, and can write better idiomatic French than a good percentage of the French population. Accents are hard if you don't have the ear for them.
