I have asked this question to myself when I started to get into crypto and came to the conclusion that holding solid altcoin projects seem to give better returns 
Yeah just like now that the correction is approaching I convert 70℅ of my bitcoin into some potential altcoins like eth, waves and ltc just to be safe and have a good return of investment. Better than to be safe than sorry, I think its the wisest move so far. Don't put all your investment into altcoin, I mean leave some btc into your wallet as the price now is so good.