GNW better cuz u will get more and better ninjas to use.

In my personal experience I think its better to use 300 together each reabate ( not the one that gives 7 days seals ) gives more frags than 500 or more

I spent 600 got 15 frags but when I spent 300 I got 11 that's why I kept using 300 only to get 10-11 which made me have 57 frags now with 1800 seals