Like your other thread, "best" depends on what you're working towards.
I started lifting at age 33 and Mark Rippetoe's Starting Strength was very helpful in learning the movements. Jim Wendler, author of 5/3/1, recommends it for this purpose as well. Lots of diagrams and detailed descriptions. There's like 41 pages and dozens of pictures and illustrations just on the squat.
Applying Rippetoe's squat methods really helped my squat take off, and today I can squat somewhere north of 500lbs. I don't do everything the Rippetoe way on my squats, but they're pretty close.
I like where you're going with 5/3/1 for programming.