Is it worth to buy the mig 21 bison?

i wondered is it worth to buy the mig21 bison or the phantom is better or even the harrier 10t?
i just want to know what would be the best thing to grind the British tree
(i dont want to buy premium packs even with the discount)

Bison. When I got my, the first match I was in and the next was an Ace

I’d recommend it, it’s definitely the best option for grinding British air atm and should be even better now that it can’t face the premium Su-30s (although the F/A-18C may be pretty good after the recent BR changes, but you still can’t go wrong with the Bison). Personally I used to grind British air, it went pretty well. Your flight model is horrible though, the only competitive aspect of you are your missiles, and you must always remember that.