I’ll tell you from personal experience. When I went to Japan, I signed up for a Mobal eSIM https://www.mobal.com/japan-esims/ in advance. And it was a real lifesaver. I got off the plane, turned on my phone, and was instantly online. I planned my route, messaged my friends, and got to the hotel without any hassle. No hassle at the airport. This was a huge plus for me, since time was already short on the trip. I recommend it to anyone planning to go.