I would say that each has its pros and cons. I do both, I hold some Bitcoins and I also day trade (various coins). If you are starting out, go for some trusted crypto exchange (in case of hold) or crypto broker (in case of day trading). Blockgeeks has an extensive guide on
how to select a crypto exchange and Tradinbeasts on
how to select a reputable crypto broker. Hope this helps.
Everyone should do both! Deeper discussion about this will lead that you need to do both if you wish to be successful in long run. Having some fiat (or stable coin) and bitcoins (or desired coin for trading) on holding, adding more when you can, and amounts for trading (of course from both) will put you on the right spot and you will be able to act according to the current market situation. Again you need to choose bitcoin (or some other coin you believe) so if you make a bad move and you get stuck with coins you can simply put them on hold and use your stash to continue with your trading strategies.
It's not a question is it better to trade or hold, question is about choosing the right coin and right timing! If you choose good you make profit, if not you use your backup strategy (better to have it, you learn that along the way)!