AttObl: Yeah, Enemy Within requires Enemy Unknown.
It's worth it, but when you get tired of Enemy Within, there's Long War.
GabiMoro: yyahoo: I believe on the PC EW is an expansion to EU, so EU is required. On the consoles, EW is a standalone title.
GabiMoro: Thank you both for your answer, I'll think about it.
XCOM EU+EW +DLC has a base price of 30 euro. I might grab it at 75% discount (7,5 euro). Quite expensive but I have 12 euro in my Steam Wallet, from selling trading cards.
It's an awesome game. EW adds a lot of stuff that forces you to make difficult choices. It influences you to finish fights more quickly in order to garner valuable resources. EU doesn't have that, but as a huge TBS fan, I really enjoy the safe strategic style that is rewarded more in the base game, carefully choosing your advances so that you do not lose any of your experienced troops.