As a spotter who relies on the strobe flashing pattern to identify many aircrafts, I can confirm many airbus planes have the double flash wing tip strobe. There are exceptions, however (based on my observations at YYZ).
Many (if not most) A 319, 320, 321, 330, and, 340s have the double flash strobes. Now, I say most because Skyservice's A330 (C F-BUS) for example, does not have the wing tip strobes. I've also observed some other AirCanada airbus planes without the wing tip strobes. Not many, though.
The A300s flown by FedEx do not. They flash from side to side. Same with the ICC A300.
Personally, I really like the strobe pattern of the 777. I find it dramatic. It give an ominous impression, i find. And, they're soooo bright! I love it when the British Airways 777s are in town.
That's my impression. Thanks for reading.
Nevermind political correctness - Envision using your turn signals!