The crimped connector is a "cold weld" and makes the best electrical connection. Down side is they are larger than D-subs. And can't be undone, except to cut wire.
D-Subs are small and can be undone. But the smooth sliding interface between pins is not as "solid" a connection. Probably good enough. I used D-subs on the electric elevator trim due to small size needed to go thru the clearance holes and potential to take it apart someday to change motor. And d-subs in all the avionics connectors of course. But butt splices every a splice was needed.
What are the downsides to using male/female D sub pins and heat shrink tubing in lieu of a but splice where no tension will be place on the connection? This makes a very compact connection.