Dashbeam is more for occasional transfers, it seems. You want to send me something right now, you use Dashbeam.
Syncthing (which is great and I use) is more for background sync between devices. I use it to sync and backup my important documents automagically between my devices.
So, Syncthing is definitely great and you should use it, if it fits your usecase. I don’t know about Dashbeam (in the sense of whether it actually works or not), but the usecase seems a little different.
Dashbeam is more for occasional transfers, it seems. You want to send me something right now, you use Dashbeam.
Syncthing (which is great and I use) is more for background sync between devices. I use it to sync and backup my important documents automagically between my devices.
So, Syncthing is definitely great and you should use it, if it fits your usecase. I don’t know about Dashbeam (in the sense of whether it actually works or not), but the usecase seems a little different.