A PTS output would be much more usuful in the longrun as I assume it will export as a single cloud. A pts file has a header containing the number of points, all software that can read PTS imports them much much quicker than any form or XYZ as it does not need to read the file to know how big it is.
PTS format
12345 number of points
x y z i r g b
x y z i r g b
x y z i r g b
…