Hm, really not easy. I like the Asso TC6.1 and it came beginning of the year so it is a new car. T3 2012 seems to be updated soon. And S411 is already a long time available - maybe an updated version comes soon too.
Maybe T3 2012 is best for me but I remember at my offroad days the XRay was good but it was necessary to add some tuning parts to get it to the same level as my Mugen was out of the box.
I read that the TC6.1 is not as reliable as the T3 and the quality of the kit as well as of spare part is not as good. Not sure if this is right But maybe one or the other can give a short update here.
Cheerio
racer_hh