I’d suggest using collada for now. The last time I used a lgTF 2 exporter, two different exporters, the exports had animation issues. The lgTF 2 exporters may be better now, but without knowing I’d suggest using collada.
In a few months to a year, I’d definitely recommend using lgTF, but for now (to the best of my knowledge) the lgTF exporters are not quite there yet.
Also, I should mention I was using Blender3D, if you are using another modeling tool you may have better results with lgTF.