what would he had done that would be fundamentally different from Turdeau to turn this country around?

On a fiscal basis probably not, maybe would be more friendly to resource industry infrastructure. But on a "vigorously attempt to shift the cultural paradigm towards progressive horsehit" basis, yes he would be different. And that alone is better than JT. He's a Harper disciple, Harper very actively just let social politics and movements come and go and not enflame them or even comment on them.

Like I said, I agree with O'Toole on more issues than MacKay, but a marginal improvement from JT to MacKay is better than having O'Toole and almost 100% certainly getting 4 more years of JT.