This is one of those that can really go anyway. Virtual Treeview is open source and well maintained by the community. DevExpress is a commercial product and is also well supported. Both provide an excellent user experience, but the programming experience is very different.
Since it is not known what will happen in the future, my personal preference will be what you know best. The time you save now will help you finish your project earlier. At the same time, any choice you make in the component library runs the risk of not being in the long run, so if you buy a component, insist on the full source, even if it costs a little more.
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