I agree with Tigerlulu. I also think it depends on your routine. If you're someone who's there when the park opens, I think you'd appreciate having Park Hoppers. It's difficult to stay at one park an entire day without getting exhausted.
We typically open one park, go back to our resort for a midday break, then head to another park around suppertime. Sure, you could go back to the same park you visited earlier, but most people appreciate the flexibility and variety.
You could also stick a relaxing resort day in the middle of your vacation. Going six days in a row is actually quite wearing. You might want to visit Disney Springs, too, which has wonderful restaurants, bars and entertainment.
I hope you have a wonderful trip, whatever you decide!