Maybe I should switch my money to FindMyPast

So that I get this right - they will put online service records of men who were discharged between 1900 and 1913.
However some, I would think the majority of them were discharged to the Reserves, and got called up in1914. and those records are the "burnt" ones by and large. And you take your chances with their survival unless the man was still serving in Aug 1920, in which case records were transferred to MOD and survive.
So will FindMyPasts records only be for men who were discharged and were not recalled to the Colours in 1914?
For example, the record, if it happens to exist, on Ancestry for a man who served from say 1904 to 1909 was discharged to Reserves, then recalled from 1914 to 1919 will show his complete record from his enlistment day in 1904