What background do you recommend ?

For Steam, your PC, etc? And what general theme would you like?

i have this one in steam and on desktop. best ever

the one you like?

This is getting out of hand. Asking for games recommendations, I can see that as though you may like both games, they may be worst than what they look at first; but backgrounds? What you see is what you get, you should pick one that you like, not something that somebody else likes.