Interesting from an investors point or technologically? If from investors point then my vote would go for Cardano, VeChain and CPchain.
Opposite with you if i go with technologically i will definitely go with Bitcoin , Neo , ETH and ADA. Because they're the most potiental coin right now on the board.
Indeed, the coin you mentioned has a big future,
but anyway in the world any cryptocurrency could happen,
the most important we just follow the development