Getting an NFC tag inside a business card requires special effort, while QR code is just different pixels for the printer. Even if you opt for NFC stickers, it still costs lots of money (if you want to do hundreds of cards) and effort (you have to stick and program them).

iBeacon is bullshit. I sincerely hope it'll turn into something useful with time, but for now, it's just a toy for advertisers.

Also, solutions add up. In our local Hackerspace, we often used a combination of QR code, plaintext credentials and an NFC sticker for things like Wi-Fi access and switching lights on/off wirelessly.