I think its always better to sell coins when price goes higher as there is no assurance what price it will be holding in future so its good to make safe profits regularly.
It depends on if you think the bitcoin price will be higher in the future. If so, it is better to hold the coins.
If you hold it till the end of the year then you will surely make big profits from it as price will go higher by that time and spending at that time can be really profitable.