Everyone here trains differently, using many different programs, many different styles of training, and usually with their own personal twist.
No one training system is best, because doing the same thing all the time will eventually stop working. Why choose one method when you can do them all and get much better gains from the constant "switching up" ?
Some popular methods around here:
Westside
P/RR/S
K.I.S.S.
Baby Got Back
Bill Starr 5x5
H.I.T.
Texas Method
Starting Strength
German Volume Training
Escalating Density
5-3-1 Method
There are probably a million more. Most programs don't even follow a "system" as such, but are tailored to people's goals.