In it is better to choose long term because it will gain more than the short term.my opinion Both had advantages and disadvantages.Long term survival coins are best coins which can be grows in the market in the same time. Please choose the bitcoin, ethereum, litecoin crypto currencies which can grows and survive for the long time.
If you're talking about the trading, as for me I do short term trading only, less profit but its a sure win beacuse you don't need to gamble for big capital, only small will do and its also profitable.