To tell the truth, i just played Monument Valley 1 and it was / is a beautiful game. The Second release looks more advanced, but also refined, but i would have to choose, i probably still would start with the first, original version, because it is the core experience, look here:

If the old version doesn’t work anymore on the latest hardware and / or if you want a more up-to-date and a bit fresher experience grab version 2 and enjoy beautiful graphics and sounds.

More information can be found on the games website @ http://www.monumentvalleygame.com