One was John Browning’s masterpiece firearm, the other was nicknamed “the right arm of the Free World” because of its nearly global presence as an answer to the Kalashnikov. Both weapons are among the most successful military firearms ever developed.
My articles at War Is Boring explore the history of the M1911 .45-caliber pistol and the Fabrique Nationale FAL 7.62x51mm battle rifle. It’s been said that the M1911 is the best military handgun in the world not only because of its rugged reliability in the field but because of the power of its .45 ACP cartridge. (There is no denying these implements are designed to kill people efficiently.) The FAL could have been the U.S. main battle rifle of the 1950s and 1960s had not the politics of procurement and shortsightedness of military brass obstructed its adoption. Would it have been better than the M14, which fired the same NATO cartridge? In my opinion, yes. The M14 has enjoyed a renaissance as a designated sniper’s weapon and it is great rifle. But the FAL was adopted by almost every NATO country, which means both parts and ammo would have been more readily available.
You can make up your own mind about these weapons and I hope my articles provide grist for the mill.