REL T ZERO VS. T2

I am looking for a sub to augment my Proac Tablette 8 Reference speakers. I want to spend $500. I could buy a new Rel T Zero or Rel T2 (A few online retailers still carry them) both for $500. While it's obvious the T2 would have more bass since it's an 8 inch vs. 6.5 inch woofer, any experience on which one has more tuneful bass?

Again, I don't care about quantity, more so quality.

Thanks in advance