Thief vs. Assassin's Creed...

[JumBie]

Why not also look into Dishonored?

This.

And go for the "Ghost" achievement makes it really fun.

Yup. Dishonored is easily the best stealth action game to grace the gaming community in the past decade. Everything about it was so well done, I found my self thoroughly enjoying every minute of it.

 

[Morbus]

Yup. Dishonored is easily the best stealth action game to grace the gaming community in the past decade.

Apart from Thief: Deadly Shadows, Hitman, Alien Isolation, Deus Ex, Splinter Cell and Metal Gear Solid, yes, it is the best.

Dishonored isn't a bad stealth game by any means. It's solid. But it's not brilliant. Even Dark Messiah of Might and Magic was better at that, in my opinion.

 

[tidy]

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[Morbus]

I have the steam version and it works on Windows 7, last time I checked...

 

[Zorander]

I played both Thief 2014 and Assassin Creed IV back-to-back last month. AC is no contest better, be it the plot, contents, immersion, scale and even graphics.