Which is more convenient, Bali SIM cards or eSIM?

If you're planning a 5-day trip, I recommend eSIM. The biggest reason is that you can use it right after arriving at the airport. The advantage of eSIM is that activation is really simple—you just scan a QR code. You don't need to open your phone and swap out a SIM card like you would with a physical card. Especially if you arrive late at night or early morning when airport shops might be closed, eSIM is convenient because you can activate what you've prepared in advance right away. Being able to use essential apps like Google Maps and Grab immediately is a huge advantage. You can of course buy a SIM card at the airport, but some people say you occasionally can't get a signal. eSIM tends to have better connectivity overall. For a 5-day trip, 1-2GB of data should be enough. If you'll have plenty of opportunities to use Wi-Fi at your accommodation, you could even use less. The recommended approach is to purchase eSIM online before departing Korea. If you pre-order through a service like Maltalk, you can pick it up at Incheon Airport, or you can get the QR code in Korea beforehand and activate it right after the plane lands. Note that Telkomsel's unlimited data plan is popular, so check that out.