persistence, serialization, history (run-to-run) in small self-contained program

[dan via Digitalmars-d-learn]

I'm writing a small program (compiled with gdc on xubuntu 16.04).

I would like it to remember a little data (a few kilobytes maybe).

It looks like d comes with standard support for both sqlite3 and 
json --- is there any particular reason to prefer one over the 
other?   Or maybe something else entirely? (In each case, i would 
store the data in some file, and on second and subsequent runs of 
the program attempt to recover the data from that file if 
possible.)

My main concern is minimizing program complexity.

TIA for any advice.

dan