Well I’d have to say it was WSB, the original 4 day template, although Defranco has reaaaally good programming. As I was not training for athletic endeavors I simply ran with the WSB versions.
I say this because it took me a very long time (say 4-5 years) to outgrow this. Of course I kept experimenting with other layouts, but only if I plateaued or needed a change or had a month of schedule conflicts. For the vast majority of any given year (~10 months)I kept the WSB template. When I started I was super weak, and when I ended I was not weak. If you can look up an EliteFTS article that details a 9 or 10 week beginners routine it’s fantastic. You can actually use that routine for more than just the 9-10 weeks it says.
In all actuality, I can probably still make gains on this template but the one I’m using now is working great so I’m not going back for a while, if ever. Haven’t used it in over a year FYI, but it got me my first 500 lb squat, 500 lb GM, and 500 lb deadlift, and put more than 50 lbs on my frame. Also, I started using this before I could use bands or chains. Worked anyways.