Duo is hands down the best French patisserie in the Richmond Hill area, and probably one of the best in the GTA.
Their products are more expensive than other bakeries, but it is totally worth it due to the high quality, freshness and presentation! They have typical French pastry staples such as croissants, almond croissants, brioche, apple croissants, They have typical French pastries as well as some interesting and tasty "fusion" pastries.
I can say pretty much everything here is good and you can't go wrong. However, you must try the Pistache, which is a pastry with pistachio cream and raspberries on top. The pistachio flavour is very subtle, crust is amazing, and raspberries are perfect combination.