Great question. I'm not familiar with docling-serv but pretty different beasts from what I gathered. Docling is a heavier pipeline (actually uses GPU).textsnap is the opposite: single-file CLI, small VLM running on plain CPU cores, one command, no server. Tradeoff is CPU decode is sequential so it's slower on dense pages, and it OCRs one image rather than doing full layout.

If docling-serve is already meeting your needs it's probably not an upgrade. But it installs in one command, so would love to hear how it stacks up on your images, if you end up trying it.