ngl i just went with sandisk and im super happy with how they perform. i didnt want to overthink it too much or spend a fortune on the top tier stuff, but their faster cards work well in my x-t4 for everything i need. basically no complaints from my side. just get any of the high speed ones from that brand and you'll be set. ive used them for a while now and they're reliable enough that i dont even think about them anymore while i'm shooting tho... which is exactly what you want from a memory card i guess.

TLDR: Just go with high-end Sony or ProGrade cards. Most other stuff is disappointing when you actually look at the sustained write data. Unfortunately, a lot of cards claim high speeds but they are just peak bursts, not sustained. I've had issues with the X-T4 400Mbps bitrate causing errors on cards that werent up to spec... it is not as good as expected if you try to save money here. You really need to look at the UHS-II bus interface requirements. Honestly, just get any of the professional series cards from Sony and youll be fine. They are basically the only ones that dont choke when the buffer gets hit hard during high-speed bursts or 4K 60p video. Most generic options just wont keep up with the technical demands of this sensor.