Yea the volatility of the altcoin maybe is the key factor for trading but there are still 3 important questions we can ask for the trade.
the volatility alone is not a good thing. a predictable volatility is what you should look for. otherwise you will be throwing darts in the dark and wishing to hit the target.
and that is the most important question that you should be asking yourself.
1- Which altcoins do you prefer for your daily or short time trade generally?
2- And why do you prefer?
3- Do you have any daily income goal or you trade as much as you can with this altcoins?
1) bitcoin mostly, and sometimes i do it with ETH, LTC, XMR, rarely with Dash.
2) because they are good and profitable when they are hot and not on a falling spree.
3) not really, i just look for success.