It makes sense comparing Denon DRA-800H vs Onkyo TX-8020 because they both are able to give some premium features.
Considered AV receivers have the same number of channels 2.0. Regarding power, then DRA-800H has such a W/Ohm ratio - 100/8, 120/6 when TX-8020 has a power of 90/6. The THD is 0.08% for the DRA-800H but 0.03% for the TX-8020.
Competitors' digital to analog converter (DAC) is identical to 192 KHz/24-bit. None of the models support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. None of the competitors supports Auto speaker calibration.
Only the Denon DRA-800H can connect to the Internet via WI-FI. Only the DRA-800H has Bluetooth support. The Denon DRA-800H has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Only the DRA-800H supports Spotify. Only the DRA-800H provides HDMI signal transmission in standby mode. Both competitors are not able to scale the HDMI signal. Dolby Vision technology found support only on the DRA-800H. Only the DRA-800H supports HDMI Audio Return Channel (ARC). Unfortunately, HDMI eARC is not available on monitored devices. Of the two receivers in our comparison, HDMI CEC is present in only the DRA-800H. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the DRA-800H. The setup assistant will help you configure Denon DRA-800H.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.
The Denon DRA-800H is better receiver in this comparison. Check Denon DRA-800H price