been doing squats for 2 years now with my knees to the side, ie, feet bit more than shoulder width and feet angled around 30 degrees.
i always do a full squat, ie, down till my thighs are straight.

lately i have seen some people doing squats with their feet should width BUT their knees are pointing straight.

is there any method that is better than the other?
whats the benefit or non-benefit between the two?