Depends on what you're looking for mate. If you're not in a rush to play Days Gone, go with World War Z. It's a really fun game that scratches that Left 4 Dead itch with more content coming next month. Also, it's surprisingly really popular so far so finding a match is really quick. For 40 bucks, there's a lot of replayability and fun to be had. By the time you're done with World War Z, Days Gone should be on discount (I'd give it a month before it starts dropping in price.