Response shape
The largest practical difference is not raw OCR accuracy. It is how much work remains after the API responds.
Bottom line
If your pain is post-processing, LeapOCR has the stronger product boundary. If your pain is fitting within AWS service conventions, Textract still has a case.
LeapOCR
LeapOCR starts at the application layer
You can ask for markdown when people need to read the document or for JSON that already matches the downstream contract. That shortens the path from OCR to product behavior because the team is shaping answers, not rebuilding a document graph.
AWS Textract
Textract starts at the analysis layer
Textract is designed around document analysis primitives such as blocks, key-value sets, relationships, and feature types. That is flexible, but it usually means your codebase owns the final translation from OCR output to the exact record shape the business needs.