Personally, I prefer to use Bric app, a business card reader, and organizer, which let me scan the card and store it on my mobile. It also syncs the data to the Google Contact, Outlook etc. For more details, you can check out their website www.bricapp.com

I would like to add Bric app to the above list, which works well as a business card scanner, has options to export data in CSV and also store a copy to Phonebook, Google contacts etc amongst many other features.