Bitcoin uniquely in the first place, a very promising crypto is NEO, Waves, ETH, ESP. on the market each promising myself wearing crypto crypto currency market is huge and something to advise on 100% hard.
NEO wouldn't be the coin with the most potential because people like to use Ethereum more. Even Bitcoin is more popular than NEO.
While NEO isn't a shitcoin, it's utility as a platform is only as valuable as those who are writing software for it.
Personally, if I was trying to get into the market now and worked a regular job or was broke,...I'd go all in on Aeternity.