The mobile network operators will vary according to the country but the eSIM provider will already have an agreement with them so you should focus on the eSIM provider.
The price of data plans is an important factor in selecting the right eSIM carrier as well as coverage if you plan to travel. However, you should focus more on the service quality offered by the provider, there are a lot of factors you need to take into consideration to find out what is best for you.
To help you make your choice, review our comparison between eSIM providers such as Airalo, Gigsky, Truphone and Ubigi.