If it weren't for the extraneous window decoration you end up with. I'm good with using Moom to size and shape my windows on the fly on OSX. I've been relatively happy tiling on Linux though, but customizing keyboard shortcuts gets tedious quickly.

The main problem with OSX has been knowing which window is foregrounded, especially with two monitors.

Exactly, it prevents breaking context by switching windows back and forth to access a piece of information. Tiling is, of course, another way to solve the problem. I prefer snappy because i can extract the exact piece of information i'm interested in, for example a portion of an image or a paragraph of text, instead of the whole thing.

So I've always just used Divvy for this, but Amethyst looks super awesome! I might give it a try!