I'll bite at the moment, despite not being seasoned as most. I played Xenoblade on the Wii and then the Defintive Edition many years later. In between that, I played 2 and Torna plus about 2 hours of Xenoblade Chronicles X. At this point, I'll probably wait for a remake of X, unless it seems to take another 10 or more years from now. I'm a little into Chapter 4 in 3.
The first is my fave due to the music and characters, but 2 is really close. 3 will probably end up ranking the best or second best.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 67 million (was 60 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