One thing that is forgotten is to never forget the speed of bureaucracy. Canada was supposed to have online passport renewal by now, it's still missing in action with no updated time of arrival.
(Not a jab at Canada - online passport renewal was 5+ years in the US, and even in the US it was a limited pilot that they've now "paused"; similarly, mobile driver's licenses in New York are in limbo with no ETA).
Anyways, looking at a reddit thread from 11 days ago, various people report applying Mid March, receiving in April, and it seems to be about 50/50 on whether the person got the old or new design.
I'd say it doesn't really matter unless you really want the new polycarbonate data page for durability on that end, but I've also heard that the cover is much more prone to curling/damage in the newer passport design because the biometric electronic chip was moved out of the cover (as it was in the old design) into the polycarbonate data page (new design). Or you really prefer the art in one design or the other...