I read the page but not being an expert on Flipper I am not confident I can tell the difference from the Flipper Zero.
Yeah, they should have included a comparison on the Kickstart page. If you check out the "we need your help" page, that has a chart with "Zero vs One":
https://blog.flipper.net/flipper-one-we-need-your-help/
The two devices are complementary.
flipper zero is just a small device with an SMT32 MCU, flipper one is a whole bloody linux computer, with an rp2350
I suppose the idea is it combines workflows you'd use a flipper zero + pc for into one device. Neat in idea, im not certain who it's truly for in practice. A flipper zero 2 with wifi built in and some minor improvements would have been much more welcome in my eyes.
Zero does mostly "radio" stuff (RFID, subghz, etc). One does mostly "network" stuff (wifi, 5g, etc).
It is a completely different device.
Flipper Zero is for the physical layer: radio, RFID, IR, etc... It is based on a small microcontroller and is mostly "bare metal", think Arduino, ESP32,...
Flipper One is for the network layer: Ethernet, Wi-Fi, 5G, etc... It is a "real computer" running Linux, like a Raspberry Pi.