none

sennheiser is good brand. Tracer is cheap china shit (correct me if iam out of reality). So if you want to help in decision between this 3 products i voted sennheiser with the biggest model number (must be better than model with lower number)

i think none of them are good. sennheiser hd 202 are better then hd 201, not only because parameters but because of using comfort too. On the other hand senheiser hd 202 have big defect. cable isn't durable and it's get broken often unfortunately. It's just beacase their construction. Fala repaired me that cable four times. Moreover hd 202 are really basic headphones without no "oh" or "ah" during gaming or listening the music. I'm using sennheiser hd 555 they are perfect for gaming. you are hearing everything when you are playing. But it is one problem: when you are using them walking through the street you can hear everything. Other disadvantage is that your mp3 player or sth like that must be really good because this headphones is too little for enjoining sound. This problems are connected only with using them outside. When you are using them at home they are wonderful.

So to sum up this short text don't buy cheap and basic headphones but wait and invest in sth good.
You may also try denon hp series i guess hp 500 are kinda good, or if you don't care about design you may try creative aurvana live.

Oh and one more thing: never trust trust

oh i forget. don't worry about that sennhaiser hd 555 will brake down in a month. i tested them. and believe me they had really hard test . don't buy hd 202 or 201 they have to many problems.

and here come some links:
http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones_audiophile-headphone-hd555-surround-sound
http://www.denondj.com/DN-HP500-P122.aspx
http://www.creative.com/aurvana/products/aurvanalive.aspx

many saying that creative aurvana live have the same speakers as denon in some model that are 5 times more expensive, also seems that aurvana gets many positive opinions

worth of considering...