What is the champagne of champagnes?

Surprisingly, still Miller High Life.

Knowing very little about champagne, I would assume Dom Perignon

I'm going to avoid the big famous brands that are more marketing than anything, and go with the producer I selected from a blind taste test of the regions producers when on a tour of the region.

https://www.tarlant.com/

Their Vigne d'Or is excellent.

Edit: Their Brut Zero an inexpensive staple.

Affordable : Mumm Cordon Rouge

Better : Veuve Clicqot Grande Dame

Better: Billecart Salmon

Better : Perrier Jouët Belle Epoque

Better : Krug

Better : ....... The list goes on and on, but it's all down to personal preference and taste, this is my list

Cristal if you want to show off at the club.

Top wineries are Krug, Bollinger and others on par with them.

Prosecco

What’s the beer of champagnes?

Paul Masson. Inspired by that same French excellence.

I'd probably have to say that it's champagne.