In aeon there are two types of chickens.

1 is tight or vacuum packed - around 20+ per chick.
1 is loosely packed - around 10 + per chick.

I usually buy the vacuum packee - no injection one.

1 chick can usually cut into 18 pieces small.
Sell rm 4 per piece still can untung for vacuum packed chick.
Double the profit for loosely pack chick.

For my daughter.
No injection for the chicken.

As adult dont really care, but for kids - give better lol.

Visual and packaging - of course vacuum pack more clean and hygenic.
Chicken also looks better.

Different price different quality.
More towards handling I presume.