Syncfusion is a solid choice for desktop development, especially with WinForms and WPF. Their UI components are well-optimized for high-resolution displays, but one thing to watch out for is scaling issues on 4K screens—some older components may require tweaking DPI settings to render correctly.
For interactive and efficient desktop apps, I’d recommend:
DataGrid – Extremely powerful for handling large datasets with sorting, filtering, and virtual scrolling.
Ribbon Control – Great for modernizing WinForms/WPF apps with an Office-like UI.
Charting Components – Smooth performance, even with real-time data updates.
Regarding licensing, Syncfusion's Community License is surprisingly generous—it’s free for individuals and small businesses (under $1M revenue). If you're just experimenting or working solo, it should be more than enough. However, larger teams might need to look into their paid plans for advanced support.
Have you considered .NET MAUI if you're open to cross-platform desktop development?