Pierre Poilievre appears to define handling Trump as taking him on aggressively. The American and global landscape is littered with casualties of that approach.
The reason I believe Carney is best equipped to handle US-Canada trade (and other) relations is that he understands the mix of economics, finance, business, trade, and diplomacy that task requires. He seeks common ground agreement, rather than pouring gasoline on a fire.
This situation does not call for Poilievre's pugilism, far from it.