For accounting software, WPF is generally the better choice. It offers advanced UI features, better data binding, and the flexibility for modern, scalable designs. WPF supports the MVVM pattern, making it more maintainable and suitable for long-term projects. While WinForms is easier to learn and faster for simpler applications, it lacks the customization and modern UI capabilities of WPF. If your software requires a complex, rich interface or needs future scalability, WPF is recommended. If you need something quicker and simpler, WinForms might suffice.