NFC is the way, especially for mobile devices. Other options like QR, and MicroSD cards are still necessary for maximum compatibility across systems, but you really can't beat NFC for quick and efficient signing.
Discussion
No pairing like bluetooth, and much much tighter attack surface.
Ya, the Bluetooth functionality on several hardware wallets always bothered me. On the Jade you can download a special "no Bluetooth" firmware to completely disable Bluetooth functionality, which is cool, but it really shouldn't have Bluetooth to begin with. It sho9br disabled by default, with the option to enable it by flashing a special firmware. As you say, it's just too big of an attack surface. Ideally, these devices should be NFC, QR, and MicroSD only. Anything else is putting your seeds in potential jeopardy.