I don't think a stable coin is profitable than other coins and I never invest in stable coin but I invest in IEO's. Like Moozicore is the best to invest your money for a long time investment.(
https://tokensale.moozicore.com/)
The major idea behind stablecoins is to protect holders from price fluctuations. This makes it easy for users to remain within the cryptomarkets even when they are not actively invested in cryptocurrencies that are subject to wild price fluctuations(non-stablecoins) instead of going back to holding fiat which completely moves the money from the cryptospace.