By gut feeling I’d agree on Chrétien, and there is some polling on this (which I think backs that up). This article compares favourability after first election for PMs going back quite a ways and Carney looks similar but slightly worse off than Trudeau or Harper.
Well then, I concede! To stick to my guns would require us to trade competing survey results from different pollsters. That's no fun, and unsatisfying, in any case.
That is reasonable, and why I conceded the point. Unfortunately, I cannot remember where the notion got into my head, and it's a bigger pain then it might seem trawling search results to find current articles with peak approval for both men.
https://angusreid.org/prime-minister-mark-carney-first-month...