Without a doubt, Vision Smarts, the developers of the pic2shop app: http://www.visionsmarts.com/products/vs-barcode-reader.html (my company ;-) Seriously, I believe the top commercial SDKs each have their strengths and weaknesses. read more
A barcode scanner SDK for such an app must thus scan all consumer codes (UPC-E, UPC-A, EAN8, EAN13 and QR codes) fast and reliably, must provide the best-possible user experience (e.g. deal with shadow or glare) and should support the largest possible number of mobile devices and platforms for maximal distribution. read more
Additionally, it future-proofs mobile apps for the increasing adoption of Digimarc Barcodes in retail and beyond, which no other barcode scanning software can address. The Digimarc Discover® SDK is a comprehensive discovery platform that scans 1D barcodes, 2D/QR codes and Digimarc Barcodes all for just 2 cents per projected end-user download. read more