Two recipes for Fettuccine Alfredo, the classic version and the updated Americanized version...you decide which is best!
The original Fettuccine Alfredo recipe was created by a gentleman named Alfredo at his restaurant in Rome. He made the dish table side, melting the butter on a warmed platter, adding the pasta and cheese and tossing them all together to create a sauce. He did not add cream. Sounds delightful, but not super practical.
At some point, probably in its travels west, cream was added, which is most likely the version you remember from your childhood. Both these versions of Fettuccine Alfredo are delicious. We will leave it up to you to determine your favorite!