Minus the obvious BTC for the looong term win, I'm going long on:
(1) Sia
(2) Dent
Here's why:
(1) They're both really cheap right now
(2) They both seek to unsettle massive players in established markets. Sia is smashing cloud storage players and DENT is disrupting data strongholds in mobile
(3) They are already delivering fantastic products
What are you long on, and why?
It is good to diversify your investment and in doing that its also good to look out for coins that have good potential and the two coins you mentioned are both good, but in doing that you should also look out for other coins that may be also profiting in the future and in other not to put your eggs in one basket since we living in a speculative market the need to diversify is very important.
There are also some levels of diversification in this portfolio, but not so many.
Both projects are very promising and it is a good option to go a long run with them. I would probably add some portions of a high valued crypto such as Bitcoin-Ethereum in order to eliminate the risk more.