Since nobody has any interest to give you any feedback....................
I do.
I am Polycount.xyz, switching to CGAMP.com end of June 2022.
I´m still new to CGT because I do 4 another FULLTIME jobs in the 3d biz, but slowly I get the curve. So, my opinion is definitely FBX, followed by OBJ.
I´m still not sure about that, but I guess most buyers use stuff like Blender, followed by LESS indiviudals with Max and Maya. So, Fbx & Obj is good to go!
I Hope I could help you a bit.