The expandable subfile is pretty much same as the loadall subfile, both having a buffer limit of 9999. The only difference being in case of expandable we have to take care of the page down.
My query is if both of them are nearly same then what is the advantage of using an expandable subfile over a loadall subfile?
The screen is displayed faster when a request is processed by the application. No need to wait until all records are loaded and then the screen will be sent to the display. One page (aka 13 records, ±) are loaded very quickly, so even scrolling down is just minimally slower.
The older the machine, the more apparent the effect.