Ask me again in about 10 years when I (hopefully) have several hundred thousand miles on the V6.
Right now, I have no need for the V8, which I believe is over 200 pounds heavier than the V6 (cast iron vs. aluminum block). This sort of supports veloindy's experience with the V6 having a little better handling.
However, Toyota's 4.7L V8 is regarded as one of the best, most durable power plants in the industry. If the more modern V6 ends up holding its own in this regard, I will be completely happy.
If not, I would say "Wow! I could've had a V8."