I think that the top coins will be Bitcoin, Ethereum, Litecoin, EOS and Cardano. However, there is a lot of development undergoing in Blockchain gaming. Blockchain technology solves a lot of the gaming industry's problem (not saying that this is the only sector where problems can be solved) and they can used immediately. The global gaming industry is huge and growing yoy. Many companies are setting up ecosystems and secondary marketplaces for skins, in-game items that gamers are really attached to. I wouldn't exclude projects like WAX for example and even newer projects like Bitguild, BUFF and Alto are providing solutions to gamers to their pain-points.

So yeah, potential coins - look at gaming market. In my opinion.

Just my 2 cents.