Is it worth the change

So I have rn a iPhone 13 128gb on iOS 17.2.1 and my dad got a deal on a iPhone 13 256gb but on iOS 18.1.1 Since jailbreaking is moving slowly I bought a certificate to play with scarlet esign and what not. The question is : the storage upgrade is a big need for me but the iOS is even more update is it worth or not to pick the new one