In DIRECT modes, you won't hear any difference between the 2.
But you will hear the difference if you use Audyssey Dynamic EQ.
However, there is no guarantee that you will prefer one over the other. Buy from a local Best Buy or from Amazon Prime just in case you don't like Audyssey Dynamic EQ.
Even if I were a billionaire, I would never buy any Pre-pro without Audyssey Dynamic EQ.
For example, I think the most expensive pre-pro right now with Audyssey XT32 Dynamic EQ is the $7,000 McIntosh MX122. The Marantz AV8805 is $4,500.
But that's just me.