Should I get Farcry 2 or Primal?

Played Farcry 3 & 4 and really enjoy both. I like open world, is very fun =) Is Primal story ok enough? I like the setting and that there’s animals. In 3 & 4 mostly I explore and take outposts when I come near them, but sometimes If I'm tired of that, I like to play the story a little :).

Must I buy Farcry 2 or Primal? Don't know what is better.