C++ is better, I think.
I am also trying different OCR SDKs in symbian platform. I found C++ and C are best choices for OCR application in mobile. You know most OCR engines are computing-intensive, so for ExperVision
OCR, they use C/C++, for Abyy
, they use C++, for Tesseract free OCR, they use C++ too.
C++ also give you highest efficiency and convenient when calling OCR SDK or other necessary image processing libraries. C++ also have good resources in other GUI and communication development library.
Anyway, I prefer C++.