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.
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?
my answer is :
1. i don't have favorite altcoins for my daily or short time trade because i am not sure to do with one coins for daily, maybe for short i think its fair enough. i only do trade if i see there is a differences in price and i can do pingpong or something to make profit.
2. we can not depend only on one coins because there many coins that will be the best choice to trade and i don't want to missed any single opportunity to make profit.
3. actually i don't have any daily income goal but sometimes if i can see the big chance to make profit, then i will doing trading as much as i can and i think it could be more than 2 hours.