The other person logs Dual time which counts equally for licence revalidation purposes.
Ah, not in Canada:
“dual instruction flight time” means the flight time during which a person is receiving flight instruction from a person qualified in accordance with....
If it's just a check flight, what's the instruction?
My insurer wants a record of my PIC time for their purposes. They're happy to see "dual" time too, if I was receiving training, but it's the PIC time which interests them most for my PIC flying!
the two pilots disagreed as to who was responsible!
Which licensed and qualified pilot signed for the plane, and made the entry in the aircraft log as the PIC? That should answer that....