It’s strongly recommended to compare different receivers if you want to choose the best one: Denon AVR-X3700H vs Pioneer VSX-531.
The number of channels for receivers is different - 9.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the AVR-X3700H has such a ratio W/Ohm - 105/8, 135/6, while the VSX-531 has a power of 80/8, 140/6. A common feature for devices is the same total harmonic distortion - 0.08%. The Bi-amping function is implemented only in the Denon AVR-X3700H. Both Denon AVR-X3700H and Pioneer VSX-531 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Each of the receivers has a Bluetooth connector. The AVR-X3700H has access to the Spotify service. Signaling over HDMI in standby mode can provide the AVR-X3700H and the VSX-531. Video scaling is only possible with the AVR-X3700H. Operation with the Dolby Vision is only possible with the AVR-X3700H.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-X3700H has 7/3, and the VSX-531 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the AVR-X3700H. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. The AVR-X3700H has support for the standard HDCP 2.3, compared to the VSX-531, which supports the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Denon AVR-X3700H. There is an ECO mode in either AV receiver. The Denon AVR-X3700H can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the AVR-X3700H. Only in the AVR-X3700H realized a DTS:X surround technology.