Choosing the right ASP.NET Core approach

Blazor would be great if:

• You want real-time updates as users input their cards
• You need rich client-side interactivity without writing JavaScript
• You want to share code between client and server
• You're planning to make it a Progressive Web App (PWA)

Razor Pages would be suitable if:

• You want a simpler, more straightforward approach
• The calculations are primarily server-side
• You don't need complex client-side interactions
• You want faster initial page loads

MVC would be better if:

• You need a more structured separation of concerns
• You're building a larger application 
• You want to follow REST principles
• You need to support multiple views of the same data