Objective: How much do I inflate the balloon when making yarn ball art?

Which of the following solutions is more sound in terms of naive physics reasoning?

Possible answers:
[+] do not inflate the balloon to its fullest capacity since you want the balls to be round and not oval..
[+] do not inflate the balloon to its fullest capacity since you want the balls to be square and not oval..
do not inflate the balloon to its fullest capacity since you want the balls to be round and not oval.