I quickly found that widespread when I arrived in Fredericton in 2004. I expect major increases in cross-provincial immigration has changed things in the last twenty years, but my experience living first in downtown Toronto and then in Atlantic Canada was that Maritimers are superficially friendly but not readily welcoming of those from away, while downtown Torontonians are initially wary but once introduced, very welcoming of anyone from anywhere.
The way that Maritimers, and especially NBers, have reacted to people from elsewhere in Canada, but especially from Ontario, moving there since COVID has been the opposite of friendly. Maritimers might pride themselves on being friendlier than everyone else but they will infight and find an internal enemy very easily and very quickly.
Catholic v Protestant, French v English, From There v From Away....
Any Liberal parachuted into downtown Toronto will take it if the Liberals are doing well. Carney should go for a competitive traditionally Liberal riding held by a Conservative. They'll need every seat they can get.
Very quickly:
Edmonton Centre -> Currently Liberal, held by Randy Boissonnault
Edmonton Strathcona -> Currently NDP, very firmly an NDP riding
Edmonton Griesbach -> Currently NDP, won it in 2021 by ~3% over the CPC with the LPC a distant third
Edmonton Manning, Riverbend, West, St. Albert, Mill Woods -> All currently CPC. Manning was won by ~10% by CPC, Mill Woods by only 4% over LPC, the others by 10-20% or more.
Mill Woods has been split into two new ridings, Gateway and Southeast, whilst St. Albert has been pushed into a new rural riding north of the city. At first blush, and without knowing exactly where Carney is from, i'd say he should take a stab at either Gateway or Southeast, as there is already Liberal support in both.