Best 2 altcoins right now are Lympo and NEO.
Lympo, best recent surprising coin, with the aim of an healthy lifestyle ecosystem powered by user-generated and user-controlled sports and wellness data. Furthermore with the upcoming release of the wallet app and the use of wearable fitness trackers data there is still a lot of potential for climbing up to the top. Paired with the growth of the global wearables industry, the Lympo ecosystem will enable users to provide individualized, verified, self-generated data and receive LYM tokens in return. The user will then be able to spend it on various goods as well as services in the Lympo marketplace, which will eventually encompass a network of health, wellness, and sports services and goods.
My second one is my most favourite one for the whole time: NEO. NEO with it's Network with other blockchains (NEOX link), Developer Competition, Project ICOs based on NEM5, Partnerships, Onchain, etc.