What is the best addon for traffic in FSX, MyTraffic or TrafficX or something else.Thanks

have you tried world of ai? http://www.world-of-ai.com/

Thanks looking at this now, I believe I had this before but have not had FSX and addons since rebuilding my PC.

Take a look at Ultimate Traffic II over at Flight1 as well. The AI Aircraft fly flight plans instead of great circle routes. It seems this gives you more interaction with AI while in flight, both seeing them and listening to ATC transmissions. UT II also seems to give less of a hit to framerates than WOAI at least on my system and from others I've read. I use WOAI to fill in some of the airlines missing from UT II. It works out great! Good luck and have fun!!!