wow, having a named brand of connectors is a step too far for me (g).
If I'm wiring motorcycles or cars and its going to be there for the life of the vehicle, I always slide heat shrink on first, then twist the wires together and solder. Then a put a dab of silicone on the joint itself, then heat shrink till silicone is spread all the way along.
If I know it will be removed in the near future, and its a pain getting the soldering gear out for 2 joints, then I'll crimp, but use the spring ratchet crimper and then tape the join.
never had a failure of a connection, not once, ever.