What Matters Most for Research Work
OCR accuracy is the priority — the whole point is capturing text correctly the first time. Connectivity matters because captured text usually needs to land in a citation manager, document, or spreadsheet rather than stay on the device. Language support matters for anyone working with non-English source material.
Portability matters less for desk-based archival work and more for anyone working across libraries, special collections, or field sites.
Standalone vs. Connected for Research
A connected device that types straight into an open document tends to suit citation and quotation work better than a standalone reading device, since the goal is usually digital text, not audio.
What This Doesn't Replace
A scanning pen captures selected lines and passages. It is not a substitute for a full document scanner when digitizing entire books, chapters, or large collections.