Pierre,
My understanding from the Garmin manuals is that the 496 can display a small number of traffic targets (limited to 8), IF you have a GTX 330 or GDL 39. There's a Garmin proprietary data format that nothing else that I've seen provides. There is some rumbling an the Stratux community that it would be nice to have that but no one has coded it yet.
Since I have a D-180 and a 496, I looked into it extensively. I was at one time planning to pull the 496 and use a 696 instead. Same deal; GDL-39 only, but a bigger screen and it could display up to 30 targets. It's all about personal choices and preferences, but in the end I decided an Android tablet with a very nice, bright screen and a Stratux receiver was a better idea. I think I spent less on the tablet, Stratux setup and the RAM mount than the GDL 39 alone would have cost.