I don't disagree with Darth's points here but the security model on phones is different from laptops. Most phones have much tighter restrictions in general vs. your typical laptop. There are far more targets on a desktop OS in general.

Now, you can run a laptop in a very secure manner but I would believe an iPhone or GrapheneOS phone are far less vulnerable than your average PC, even MacOS or Linux. Someone could write a book on the vectors of attack on a laptop. Phones are not great either but IMO they are marginally better.