You will not go wrong with either of the two. Both are fantastic but if you are yearning for a return to a more Myst type atmosphere I would say Quern: Undying Thoughts. Both games will give you a couple dozen hours and more of great game play. Quern has been likened to the new Riven. One thing you must absolutely pay attention to in both games is it is imperative that your computer meet the minimum specs but I recommend surpassing them for a great experience. They are both somewhat demanding games so if your Desktop (not Laptop) exceeds the minimum specs then dive into a couple of worlds that will bring back the ahhhhh moments of playing the Myst series. Let us know what you choose Scotty.
"Don't Hate Me Because I Am Beautiful...There Are Many Other Reasons!"