Lemonade:

Lemonade is quite sour.It has a gritty texture to it. 

Anyone can drink lemonade. Lemonade is only available in one class. There is not one brand of lemonade on the market that is any more expensive than the next.

Champagne:

Champagne is rather tasty. The bubbles make it better than lemonade. The carbonation makes it a litle more like soda than lemonade.

Just about anyone can have champagne also. Champagne comes in many forms. The very best champagne on the market is reserved for those who live a privelaged life. 

There is a saying that when life throws one lemons he or she makes lemonade. I would like to be tossed a few grapes occasionally. I want to make some excellent champagne. The cheap stuff will do though.