A pizza oven is for rich folk. You can make almost the exact same thing on a regular grill, but the grill can cook burgers, steaks, brats, veggies, smoke briskit, etc. etc. etc., while the pizza oven is basically only good to make pizza.
I have a grill, and my attempts were pretty poor. Costco had a small stock of the Solo Stove Pi Prime gas powered oven for about $125 off the factory price. It had a learning curve, but I can crank out the pies now. Since I live 20 miles from the closest decent pizza place it’s nice to be able to roll your own. It’s quick too, cooktime is about 3 minutes.
If it’s a really good grill. Pizza ovens need to be able to cook at temps of 750 degrees F or more. .