Xbox Game Pass or Ultimate for PC?

Does it make a difference if I get PC, Xbox game pass or Xbox Game pass Ultimate? If I only play on the PC?

Yes, you need Xbox live (included with ultimate) to be able to play online on your PC and if you only run Gamepass you can only download games that are compatible with the PC and only in offline mode and for as long you pay for the gamepass

Thanks for your help! But I thought playing on the PC is always free.

At the games together with Xbox so where you can play on Xbox and Pc I also had no Xbox live recently and I couldn't play online so you need Xbox Live to play online I think