I'm looking into both of them, and while I have been quite pleased with NetAdvantage at my previous employer, I find the price point (plus testimonials like at What is the best winform UI component set?) to make me hesitate and consider DXExperience.
That said, I'm wondering:
This is for WinForms - and also a last question:
Note: This is not intended to incite a flame war, I am interested in experiences, and pragmatic advice.
We evaluated libraries from Syncfusion, Infragistics, ComponentOne, Xceed, Janus and DevExpress. We decided on DevExpress based on its feature set, grid performance and features and ribbon control features.
Comparing Infragistics and DevExpress Grid control I found that:
The DevExpress DxGrid control for Windows Forms is fantastic. Inline editors make the UX very nice. The sorting and grouping is easy to use and understand for both the developer and end-user.
Overall I am extremely happy with the library. Their support is excellent. Over the life of this project, I have asked over 20 support questions and have received a good response each time.
I would spend my own money on the DevExpress controls.