I’d recommend Airalo! You download the app, buy an eSIM and then install it straight to your phone.

I have an older iPhone (that does support eSIM) and I only use an eSIM. I don’t have a physical sim in mine at all! For me it’s a security thing, nothing to remove so they can’t turn mobile data off without unlocking it first. But yea you can easily travel with eSIM! And you can have two active at once.