This is what the GT-R owner said about both cars on the second page of that thread:

Rather than write a massive review you just need to look at the cheesy grin on my face to see i also loved the GT3. I was impressed it was superior to the R8 and 911 i drove but don't think i could own one, as im way too jdm.

Seeing them both together and having driven both helps you look beyond the new rivary bigged up by fan boys and journo's. They are both the greatest driver cars on the planet at the moment and both have there own unique qualities. I prefered the weight, cage and size of the GT3 but the power, box and drive of the GT-R.