Cointreau vs grand marnier

Cointreau vs Grand Marnier? Both are liquours. Orange flavored liquours. Grand Marnier is about twice as sweet ounce for ounce at Cointreau and so for a margarita the lime juice should be twice as much for the G.M. They both work for a good margarita as long as the tequila is 100% agave plant and either blanco (unaged) or reposado (just a few months.) Never use "gold" -- artificial coloring. Ugh!. Aside: G.M. is made from a base of Cognac, for what that is worth. I recommend trying both in a margarita and finding what you prefer. Try to avoid generic triple sec, since it is very sweet and not subtle. My favorite is Cointreau, because of it's dry and subtle flavor. You can also try Cointreau on strawberries.