The 400 credit one just looks good, nothing else, but the Plus bag will allow uyou to put another set of clubs in it.
Some players like to have more than one set of clubs, EG I used to have the G20's and excellent they were, as were the rocketBladez, but I sold them both for a pittance and have the R11's now.
Had this bag option been available then I may well have kept them.
Personal preference is all it is.