I have used both the TMS and FMX.TTreeview
I had difficulty with the TMS version as I had an older version of DElphi 10.2.3 and my version of TMS was 2.6. The TMS treeview did not function as advertised in that the in place editor did not present as well when I installed other components like their planner and planner dataconnection as well as their grid and grid dataconnector I had significant issues and my project not only dod not compile but when It did it gave me AV’s. I reported the issues to TMS who then corrected some of these in relase 3 + of the FNC controls that had been released after my licence expired much to my dismay thay said I could fix my problem by upgrading … Doh!
The native FMX.Treeview is actually quite good and allows one to embed additional controls inside a tTreeviewItem like edit controls and check box etc.
I replaced the TMS control with that and since an item has a global index was able to link that to an index from a FDMem table which I later replaced woth a ClientDatset file . Had too many issues with FDMemTables and live bindings failing.