For static meshes(like buildings and stuff as you need) OBJ and FBX, animated characters(skeletal meshes) FBX. You can see the rest of the formats for other assets in the content browser > import window drop down list.
For static meshes(like buildings and stuff as you need) OBJ and FBX, animated characters(skeletal meshes) FBX. You can see the rest of the formats for other assets in the content browser > import window drop down list.