Holdig your Bitcoin is best but instead, investing it in Altcoins for trading in short term basis is much better because you can gain more profits from Altcoins.
You can make good profits from altcoins only if you choose the right coin at the right time or else its an risky affair, as the life of altcoins is not too long and it can disappear at any time, and if you want to make good profits from it then you cannot afford to miss the pumps and dumps in order to make quick profits.
Choosing the right altcoin is exactly where the main problem is focused at. Nowadays altcoins are being launched in a professional way with great white papers, top notch website, somewhat decent features. These coins mostly get seen by certain people as very interesting projects, while in fact it's nothing more than another scam coin. It's a gamble where you invest your money in. You either end up making great profits, or you'll walk out with a bag full of worthless coins.
There are some altcoins that exists since long time, so if we invest in it then chances of making loss is very less but to make profits from it you need to wait for a long time and its really difficult to trust any newly launch coins as most of them turn out to be scam coins which may disappear suddenly.