Hey
@Rylan I've been following this thread just didn't want to jump in yet because everyone has been beating me to the punch with great advice
I have owned both the 4700H and the 3700H I have also owned older versions of onkyo recievers. I enjoyed both companies equally you really can't go wrong here
With that being said out of all the options I'd go with the 4700H
If you don't need 4 independent subs or Dirac then the X4700H is not worth the extra cost over its predecessor. The last gen can really do everything the new one can.
Also keep in mind the new gen models haven't rolled out Dirac and we don't know how well that rollout is going to be. Will they avoid the bug issues other companies have had with new releases? Also how much will Dirac multi bass cost you as an add on?
Also Audyssey has proven to be very good especially with the editor app for most of us so if the extra sub channels or Dirac isn't what you want then I would go with the 4700H and save some money.
Also don't worry about the # of 8k inputs. It's going to be a LONG LOMG time before we ever have a lot of 8k content out they're for us consumers
Good luck on your choices