I think the best choice is ENJ, because of the following reasons:
#1 Currently the ETH/ENJ price is 0.00024496 ($0.32, if 1 ETH = $1317), which is absurdly low. Buy now or you may not have the chance to buy it at such price. If you don't believe me, look at the chart in coinmarketcap.
#2 Just look at their roadmap!
https://enjincoin.io/ (click on ROADMAP menu). Until the end of March, they will release a pack of features that will allow gamers to have the ultimate out-of-game experience in one place. Every guild of any game will be able to create their own forum with ranks of the forum members, ect. The developers will be able to build whatever they want. Why they gonna use it? Because it will bring them money. Search for any other project and show me a better roadmap for the upcoming 2 months. There is more - the roadmap for Q2, Q3 and Q4 is even better, but I wont mention the features, because there are a lot of time till then.
#3 They have 18.7 million registered and 3.5 million active gamers with 250,000 gaming communities across thousands of games. They have 12 millions global visits and 52 millions global views per months (as of August 2017) on their website. What is that mean? It means that ENJ coin will be adopted much faster than any other coin, because when they put one big heading on their website "Enjin Coin is here. Come and try it.", the people who will buy ENJ coin will multiply enormously.
#4 Minecraft
#5 The use of ENJ coin. Do you know d2jsp gold? Well, if not, here's a short summary - they offer the so called "gold" which is a currency which can be traded for items. The trade is happening in game and the gold is transferred in the website. You can use the gold to trade for different games, e.g. sell item in Diablo II and buy items in World of Warcraft for the gold you've earned. I've used it and they have a lot of gamers trading. Well ENJ coin will replace that with better and modern solution. You can't get scammed or whatever. You will have a super good looking design for item trading. This will be future of game trading, I'm sure. Just wait, like I do. I know it will become mainstream.
#6 The logo and the colors. You haven't notice it, I'm sure, but there is a hidden mind trick for marketing. The use of colors. The combination of colors can determine if a product is well received by the majority. And I think ENJ have one hell of a pick.