It depends on what other ninja you have to work with.

If you have akatsuki ninja, don't go for Kakashi because he is only a good support for Konoha ninja.

I don't really like edo Hiruzen and don't recommend him because I feel he is limited. For gnw and bonds, or as support he is great. But for pos 1 pvp he needs to be heavily stacked. Even then

Edo Kakuzu is not very good now, but he will be powerful when his skill breaks come. If you are a f2p getting him only for his breakthrough would be a risk, because we don't know if he needs 4 stars for breakthrough or not.

Edo deidara would be my personal pick, because he is all round good and is more versatile than the above mentioned three. Also his supporting ninja are f2p friendly as you can run him with cheap ninja like Jinpachi, edo Sasori, Gakido, Jigokudo or Sakura cloak.