As a reminder, the PlayStation Portal, or Project Q, is (according to leaks) based on Android. It doesn't run the games itself, it merely streams them from your PS5 and your handheld then serves as a controller with its own display.
I'm wondering why anyone would prefer that over simply using a regular Android phone with a good controller and the PS Remote Play app?
Yeah there's a lot of give and take I suppose. There's also an advantage to the split controller attachment model in that it's more portable than a giant honking Steam deck tho I suppose.