As you will install four height speakers I would go with the Denon 4700 as it supports Auro-3D. This feature allows your stereo music to be unmixed in 3D with your height speakers. It's a really nice mode for listening to music. You will also find the Height speakers offer an advantage with Atmos supported movies.
The Denon 3600 and 3700 do not offer Auro-3D. The 4500 offers it but's it a much more advanced implementation in the Denon 4700 with controls for fine tuning Auro-3D to meet your exact preferences.
You can also run the height speakers in multi-channel mode but I think after experiencing Auro-3D immersion and fine tuning it for your room with the Denon 4700 controls you may like it better - as I do.