the friendly's french vanilla provides a notably different root beer float experience than the hood golden vanilla but it's also, as they say, “pretty good”
i would rate this combination: float/10
( as currently usually the root beer is a&w diet. the hood golden vanilla is softer and melts faster / blends more leading to a “creamy root beer” weighted experience while the friendly's french vanilla stays more solid and tends more towards “iced cream with root beer”
personally i find the golden vanilla more compelling in a sometimes problematic way on its own, but in floats they're much more well matched )