My take is to hold long term and forget about trading.
Long term holding is always a good thing, but that doesn't mean that you should discard trading (assuming you know how to trade and understand how the market works). Trading allows people to increase the number of their coins as the volatility lends itself perfectly for short term trading. Instead of sticking to one of the two options, you can do both holding and trading at the same time. Just put aside a certain amount of coins in cold storage for the long term, and use the other part of your coins and fiat for trading purposes.
It will be beneficial in two ways;
1) Your coins for long term holding purposes will gain value.
2) You manage to increase your coin count through trading, and thus gain even more profit.
The market quite often moves in a repetitive manner, which allows traders to easily exploit these price swings to gain profits.