It's totally up to you and depends on what you think is important. I advise you to consider test driving both models to see if the power of 3.0 is enough for you and whether you want the active steering in the 4.8.

For just 5 grand more, most people will tell you to go for the 4.8. Only con for the 4.8: fuel consumption.

But try to see if 4.8 had had a rough history with problems compared to the 3.0. You'll be able to determine which model you're gonna have better luck with in terms of reliability in the long run.