for high speed, high power, where failure is serious or dangerous, I'd go with riveting.
Most often the clip does not break, it is flicked off by catching something as chain travels around.
For the Observed Trials riding we do, big steps logs, rocks, just put the splice link in with the clip on the inside (assuming there is clearance to cases etc).
However you do it, the closed end must face the front, direction of travel so it doesn't get picked open and off if it touches a log/rock. stone, piece of ice or mud, etc.
kcj