Currently Online 
Interesting question.
PS1 established the brand in a huge way. No home console had sold more than NES/Famicom at that point, and PS1 cracked past 100 million units. And DualShock standardized elements from previous controllers and had two sticks.
PS2 was even bigger with GTA games, Sony titles, the added bonus of a DVD player, and so on.
PS2 is more to blame for the arrogance of PS3, but even PS1 shares a little blame as well as it was two generations of Sony dominance.
I'll give it to PS2.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 122 million (was 105 million, then 115 million) Xbox Series X/S: 38 million (was 60 million, then 67 million, then 57 million. then 48 million. then 40 million)
Switch 2: 120 million (was 116 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
