This is something that I do that usually helps:
1) look at all the color combos that the particular set is capable of playing.
2) Find a color pairing that feels comfortable to you (the most important part of this list).
3) See how it stands up against the other color pairings you came up with.
4) see which one is right for you.
Essentially the list is about looking at the options available and deciding what you are good at using. I'm good at using any deck that has Black as one of the color pairings because I can use black as either a control or destruction based color. I can make the downside of that card be a plus for me depending on how I build the deck. Whit is something that I myself want to become better at. I'm good at protecting and strengthening my creatures and Protection is something that I value. The ideals of the cards I'm comfortable with but not really the cards themselves. I'll use them if I have to.
Going off of my example you need to find what you like in this set and build off of that. You can't really ask someone what you should play because if you don't like it then that's just a wasted investment. Try looking at both the Amonkhet and the
Hour of Devastation sets in their entirety, read over the cards and see what catches your appeal. Because The answer I would give you to your question would be anything ZOMBIE related. Other than that I encourage you to find your own deck and be comfortable with it.