in my opinion the most promising altcoin is content protocol or CPT, this project was able to make a surprise at ICO reaching hardcap in just 3 week , besides the CPT price is able to up 100% of the price of ico when the first license on market
well, I think you're right, CPT is enough to bring enough profits to its investors. well, but from the past until now, I always thought ETH was the best. besides, BCH, and XRP. but, right now I'm only holding ETH and XRP.