[Question] Which Settings should i select 12M or 9M ?

[submeyar]

ScreenShot:
View attachment 70731

MobilePhone Model : Sony Xperia S

As you can see 12M videos are 4:3, does this effect video quality,
I don't know but i think 9M(4000x2250) 16:9 will be good.

Can SomeOne please explain the difference b/w 12M and 9M and
specially that 4:3 ratio thing. Thanks!