There are surprisingly few posts comparing different pizza stones, so I finally decided to order a few and test them myself. Hopefully, this thread can also be a place for others to share their experiences!
Stones tested (top to bottom in the photo):
- Casapulla (Sorrento) Biscotto 3.2cm from pizza-shop.it— BC
- Effeuno Hybrid 2.5cm (Comes with oven) — F1
- Fiesoli Arte 1.5cm from shop.fiesoliarte.com— FA
- A36/Q235 Custom Baking Steel 1/4" from Taobao — BS
- Cordierite — Not pictured, but I'll share some thoughts below.
Oven used
Effeuno P134H with digital controls (The shorter one)
Most of my experience is based on baking contemporary-style pizzas (72% hydration, Nuvola Super, 100% biga, 48-72 hour ferment, baked at 420C for 2 min), and some experience with traditional Neapolitan, NY-style, and pinsa.
Biscotto (BC) - The neapolitan must-have
The Biscotto is a thick beast that needs a solid 40 minutes of preheating to become fully heat-saturated. It transfers heat more gently than the other stones, which is especially noticeable at 420°C, where my pizza undercarriage tends to come out a little pale. I'd recommend going to at least 430°C. It's my go-to stone for traditional 90-second Neapolitan pizzas at 470°C, where the gentler heat transfer helps prevent burnt bottoms. (But leave the pizza in the oven for 2 min, and it'll still burn) For the P134H, I'd recommend the 2.5cm version to preserve more usable oven height. There are also different Biscotto varieties, such as Saputo and Sorrento, with different thermal characteristics. Unfortunately, shipping these heavy bricks outside Italy is ridiculously expensive, so I could only test one. The Fiesoli Arte is also considered a biscotto, though I find that it has a different characteristic so I'll compare it against the F1 instead.
Fiesoli Arte (FA) vs Effeuno Hybrid (F1)
The FA is actually my favorite stone, mainly because of how quickly it heats up. I typically bake contemporary-style pizzas at 420°C for around 2 minutes, and just 20 minutes of preheating is usually enough to get a nicely cooked undercarriage. It behaves very similarly to the F1 Hybrid, with both transferring heat more readily than the Biscotto and producing almost identical results in my experience. They're also versatile enough for pizza alla pala (pinsa), teglia, NY-style, and other styles. The FA is thinner, giving you more usable oven height, but needs slightly more recovery time between bakes. A one-minute boost from the bottom element is usually enough. Otherwise, I find the two stones remarkably similar, with the FA having the edge in preheating time and potentially energy efficiency, while the F1 retains heat a little better. The FA also comes in a 3cm version, and is also considered a biscotto stone. It is a pity that not more people are talking about the Fiesoli Arte.
Cordierite
Of the stones I've used, cordierite seems to transfer heat to the pizza quite aggressively. I previously baked on an Ooni Volt 2, and the cordierite would regularly give me burnt undercarriages above 400°C. It worked quite well for NY-style pizza and other styles baked below 400°C, though. I haven't measured the actual thermal conductivity, so this is purely based on baking experience.
Baking Steel (BS)
The baking steel works great at around 270–290°C. I wouldn't go much higher, as the seasoning can start burning off and the pizza bottom can scorch pretty quickly. It produces a slightly different bake for NY-style pizza and performs particularly well for tavern-style thin crust. I still need to experiment more, but the idea was to replicate the results people get from baking steels in conventional home ovens, just inside the Effeuno. I do think baking steels in conventional ovens are quite energy inefficient because it takes so long to get to temp (about 1 hour), and home ovens are generally less well insulated than dedicated pizza ovens. But it is the gateway drug to pizza making and makes some fine pizzas!
Conclusion
I think the F1 Hybrid is probably the most versatile option if you want to bake 90% of pizza styles (which makes sense why it is included as a stock stone from Effeuno). The FA performs almost identically but heats up faster, which is why it's my personal favorite. The Biscotto is fantastic for traditional 90-second Neapolitan pizza at high temperatures without burning the bottom. Personally, though, I prefer a bit more crispness, so I tend to favor longer bakes at lower temperatures.
I know some people swear by Saputo Biscotto and complain that the F1 Hybrid burns their Neapolitan pizzas, but I think this is largely manageable with proper heat control, such as lowering the bottom element to around 150°C. There's not much reason to get cordierite if you already have an F1 or FA, and while the baking steel is a fun experiment, it's probably redundant as well.
Curious to hear what others think, especially anyone who has compared different Biscotto stones (Saputo, Sorrento etc.) or the FA and F1 side by side!
Note: For Ooni users, I'm not sure what's Ooni's current stance on using any stone other than Corderite, but I hope this is helpful.