I am trying to really understand how puzzle and zombies work in the gear factory. Yes most of it I..

I am trying to really understand how puzzle and zombies work in the gear factory. Yes most of it I do. But the battle gear I have 5 star battle gear. Would it be cheaper to go to the mall and buy the 6 star battle gear and would it increase my advantage? I’m a level 20 in game but really called a weaker level 20 because learning the gear factory . Thank you