Canva's advantage is not its AI, it is everything the AI has to work with. Generated decks start from a professionally designed template and an enormous asset library, so even a rough prompt returns something that looks deliberate.
It is also the most generalist tool here. The same subscription covers social graphics, documents, print and video, so it is rarely bought for presentations alone — which makes it excellent value if you were paying for it anyway, and a slightly odd choice if you were not.
Slide output is attractive but structurally simpler than the dedicated presentation tools. For a data-dense board deck it is the wrong tool. For anything visual, it is hard to beat at the price.