Whats the difference, between a built in Bluetooth and a Bluetooth Stick?

[A.Tony]

I want to have Airdrop workin on my Hackintosh and once ordered a Fenvi Card as recommended here but it didnt work, now i was thinking about buying a stick, is that the same? or is it worse than a built in card somehow?
Thanks in advance

 

[Going Bald]

Both run off of a USB controller. If the spec is the same, chip is the same, then no functional difference.
i.e. BT on card vs BT on USB stick wold be the same if both had a Broadcom BCM20702A0 BT chip.