some yeasts called "champagne yeasts" were isolated from the "champagne" region in France and aren't necessarily intended for champagne the beverage. I would go with the Premier Cuvee that lists the champagne style in the description.
In a quick search, I found this description of Pasteur Champagne http://homebrewheaven.com/pasteur-ch...t-red-star.htm
that says that it's rarely used for sparking wine...so probably not a good choice.
Go for Premier Cuvee!