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Need to differentiate "reliable" and "strong".
Not sure which is stronger.
Both are reliable when well made. There have been more reports of liner lock failures than lockback failures.
Now, for your specific knives, I think I would trust the Fallkniven's lock more than the Buck's. There are only a few companies I trust to linerlocks as it is more hard to do right. The Fallkniven has many fans and I have only heard praise.