[Izulde]

Here is how the NFL would look with each split:

North -- Chicago Bears, Cleveland Browns, Detroit Lions, Green Bay Packers, Minnesota Vikings, New York Giants, Philadelphia Eagles, Pittsburgh Steelers
South -- Atlanta Falcons, Baltimore Colts, Dallas Cowboys, Los Angeles Rams, New Orleans Saints, San Francisco 49ers, St. Louis Cardinals, Washington Senators

North1
Chicago
Detroit
Minnesota
Green Bay

North2
Cleveland
New York
Philadelphia
Pittsburgh

South1
Atlanta
Baltimore
New Orleans
Washington

South2
Dallas
Los Angeles
St. Louis
San Francisco

East -- Atlanta Falcons, Baltimore Colts, Cleveland Browns, Detroit Lions, New York Giants, Philadelphia Eagles, Pittsburgh Steelers, Washington Senators
West -- Chicago Bears, Dallas Cowboys, Green Bay Packers, Los Angeles Rams, Minnesota Vikings, New Orleans Saints, San Francisco 49ers, St. Louis Cardinals

East1
Atlanta
Baltimore
New York
Washington

East2
Cleveland
Detroit
Pittsburgh
Philadelphia

West1
Chicago
Green Bay
Minnesota
New Orleans

West2
Dallas
St.Louis
Los Angeles
San Francisco

And here's how the AFL would look:

North -- Boston Patriots, Buffalo Bills, Cincinnati Bengals, Denver Broncos, Indiana Flyers, Kansas City Chiefs, New York Jets, Seattle Seahawks
South -- Carolina Panthers, Houston Oilers, Jacksonville Jaguars, Miami Dolphins, Oakland Raiders, San Diego Chargers, Tampa Bay Buccaneers, Tennessee Titans

North1
Boston
Buffalo
Cincinnati
New York

North2
Denver
Indiana
Kansas City
Seattle

South1
Carolina
Jacksonville
Miami
Tampa Bay

South2
Houston
Oakland
San Diego
Tennessee

East -- Boston Patriots, Buffalo Bills, Carolina Panthers, Cincinnati Bengals, Jacksonville Jaguars, Miami Dolphins, New York Jets, Tampa Bay Buccaneers
West -- Denver Broncos, Houston Oilers, Indiana Flyers, Kansas City Chiefs, Oakland Raiders, San Diego Chargers, Seattle Seahawks, Tennessee Titans

East1
Carolina
Jacksonville
Miami
Tampa Bay

East2
Boston
Buffalo
Cincinnati
New York

West1
Denver
Oakland
San Diego
Seattle

West2
Houston
Indiana
Kansas City
Tennessee

AFL is an easy, clean 3 Florida teams + Carolina no matter the divisional alignment. East/West is a cleaner, more coherent split between the West and the Central divisions, with the fourth division Rust Belty.

I hate all arrangements of the NFL divisions under that split. I'd do some swapping and rearranging to create more geographically logical divisions. You can't achieve that with the current divides.