Hello @sakai
Yes you are right, they are leveraging same OCR technicle. But Form Recognizer is designed for forms so it will work better for forms, like details and format.
I would say if your input is mainly form/ invoice/... Form Recognizer should work better.
Please let me know if you have more concerns. I hope this helps.
Regards,
Yutong
-Please kindly accept the answer if you feel helpful to support the community, thanks.