I find both easily understandable. Although I think Aussie English is more understandable. I like Canadians though and their accent. I have a few mates from Canada.
Brighton and Hove Albion FC, England and Sussex CCC
Present faves in no order: Shahar Peer, Heather Watson, Anne Keothavong, Venus Williams, Serena Williams, Sabine Lisicki, Petra Kvitova, Jelena Jankovic, Maria Sharapova, Daniela Hantouchova
Missing: Anna Kournikova, Nicole Vaidisova, Amanda Coezter, Lindsay Davenport (though see her as BBC Wimbledon pundit these days), Monica Seles!