Which platform is suitable for the mailing list service?

Question

Microsoft

Hello everyone, I need to develop a mailing list service (similar to mailChimp). Which aps.net MVC or .Net.Core framework to choose?
It seems that they say that .net.Core is faster and faster, and Linux hosting will be cheaper, but as I understand it, .net.Core does not have a large set of libraries (for working with excel, etc.).