I think both is profitable,
When price is bottom,,should have cash,,
Then buy at bottom price,,
So,half coin are hold,,half money is day trade is better I think.
That's what you called diversifying your investment, you cannot just put everything in one basket or do it with only one activity.
I am also a trader and I did not traded during the time the price has dump, also I have my long term investment for both bitcoin and some decent altcoins.