Don't think anyone with sense claims any of these are
universally superior. Each had merits and de-merits.
Think it goes something like this:-

NTSC gives the best pictures in the studio.
SECAM records best.
PAL transmits best.

#1 is meaningless, because "in the studio", you can display
RGB directly,without encoding.

It would be a very stupid studio that did so if it were intended
for analogue transmission.

How about "under ideal conditions"?