Honestly I think cordierite is not a good stone for baking. Too temperamental when I used to have my Ooni.
It probably depends on the temperature and targeted style?
At high temperatures, better stones are usually the ones with lower thermal conductivity. Like fibrament, or moreso like biscotti.
I used to use a fibrament in my home oven and liked it a lot. My folks have a cordierite that is at least 3/4" thick that works alright too.
Recently there are a lot of people trying to make something closer to NY, new haven, or even neapolitan in home ovens that barely get over 500 degrees. They seem to have good results with a heavy slab of steel, which has even higher thermal conductivity than cordierite. They can also get the steel itself over 600 degrees in those ovens, particularly if they have a broiler element.
I haven't tried using a steel. I accidentally broke my fibrament and i haven't replaced it yet. Lately I'm making all of my pizza in a wood-pellet-fired oven outside, and will probably be ordering a customized fibrament for that soon.