ExPizza Press?
I always found Pizza Express very dependable for pizzas and before we left they’d started doing vegan ones with pretty decent cheese substitutes on them, so I’m sad they’re going.
In terms of these chains I’d probably put them below Strada and Zizzi but only because those two both had specific menu items I liked.
When I lived in Golder’s Green I used to regularly request a takeaway pizza by phone then collect on the way to the tube to a gig or something. I would always, always forget to ask them to slice it so I’d just have to stand there tearing the fuck out of it to eat it as I went.