What is the best icing to go in/on french vanilla?

I use BC that I flavor with french vanilla extract...

Please tell me the difference between french and regular vanilla extract
TIA,
Kathy

This is the definition in Wikipedia:

"The term French vanilla is not a type of vanilla, but is often used to designate preparations that have a strong vanilla aroma, and contain vanilla grains. The name originates from the French style of making ice cream custard base with vanilla pods, cream, and egg yolks. Alternatively, French vanilla is taken to refer to a vanilla-custard flavour.[18] Syrup labelled as French vanilla may include custard, caramel or butterscotch flavours in addition to vanilla."