Well.. I suppose the differences would be build quality and exhaust note. I haven't used any of those, so others will have to chime in with quality.. I do know you tube is loaded with exhaust sound clips for the xB. At least that gives you an idea anyway for that half of the decision.
I also need exhaust help...I was wondering if the tsudo N1 axleback was any good for my gen 1 xb. It might not be as good as the Tanabe Concept G, Apexi N1 or a Greddy Evo 2 but it's really what I can afford.
I can get a TRD for $275 might be able to get a better deal if a few peeps buy at once.? I guess pm me if interested? im thinking of getting this but am searching facts first on exhaust,intake,etc.
On another note, videos on u tube is hard to compare as sound through a mic and real life can be totally different.