Currently on the Xbox we have some sales, i was interested in getting the Japanese or British Phantom, but should i consider something else? (Already have A5C, T-55AM1)
It depends. What nations are you looking into grinding? The F-4J(UK) and F-4EJ (ADTW) are both not particularly good planes and for Japan, despite it not being a premium, the F-5E FCU is a way better grinder, especially if you slap a talisman on it.
The best air premiums are definitely the F-5C and Kfir Canard. Both are absolutely insane vehicles.