bitcoin prices still easier to predict, because the prices are very stable. but different if you are holding altcoin, it could be a big loss if within one day you do not choose the decision to sell or hold.
Holding altcoins is really a foolish thing as the prices of altcoins are never stable and they can come down totally in just a matter of seconds, so altcoins are good for just short period trading but not for long period because altcoins can disappear and new coins can some into market so you should not just hold the coins you bought earlier.