You may find it much more convenient to buy a plan with an esim prior to your arrival when traveling. The ease of purchase and setup can offset the cost, and frequently the roaming carriers are eager to enlist new customers, so they may have free trials or discounts for new users. You save the time and effort spent hunting for a shop, dealing with the language barrier, currency issues, deceptive salespersons, etc. Many roaming carriers esims will work in the US, so you can work through the setup while home, and deal with support before it's an issue while on vacation. I frequently can connect with a carrier while the plane taxis to the gate upon touchdown.

My experience and opinion is, find a service that is pretty much a sure thing for your trip. Companies like Airalo suit many users with their rates, experience and reliability for most. Don't waste time trying to deal with a company with poor or limited support, because until you are successful with your mobile connections, you are at their mercy. As I have also mentioned, Roamless has it's place with "A Particular Set Of Skills" for many traveler needs, but I am a believer in always having a fallback, or Plan "B". Mine is the US carrier, T-Mobile with data & reasonable calling rates.