Which one next?

Hello everyone, I have just finished Mafia II, and a few months back Mafia I.

I’ve read some reviews about Mafia III and Mafia OC, and I’m wondering which should really be next.

Mafia III is currently at 39,99€ on PS Store, and the Mafia OC is 34,99€. I can now get the trilogy for 11,99€.

So, what should really be the move? Pay the 12€ to play the third game, or spend a bit more and go right at OC?

Thank you in advance for any input!