That's relative to the type of sound you prefer. I'm a fan of high quality bass first and foremost and in that regard, properly amped, I found the HE-500 to be the better of the two while still having a great and respectable handle on other areas of the music.
If I had to pick between the two, for me personally, I'd go with the HE-500. I will say I would recommend the HE-500 as a compliment to the T1, but then again, I'd recommend the HE-500 as a compliment to most head phones. Point being, you can't go wrong with them. IMHO it's the best available at that price point and could easily be the end-game headphone if someone wanted to keep their cost below 1K.