It makes sense comparing Marantz SR7011 vs Onkyo TX-8020 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Marantz SR7011 has 9.2 versus 2.0 for Onkyo TX-8020. Regarding power, then SR7011 has such a W/Ohm ratio - 125/8, 165/6 when TX-8020 has a power of 90/6. The THD is 0.08% for the SR7011 but 0.03% for the TX-8020.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/32-bit for SR7011 and 192 KHz/24-bit for the TX-8020. Only the SR7011 supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Only the SR7011 has Bluetooth support. The Marantz SR7011 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Only the SR7011 supports Spotify.
Only the Marantz SR7011 has support for High dynamic range (HDR). Only the SR7011 provides HDMI signal transmission in standby mode. The SR7011 can scale the input HDMI signal, unlike the TX-8020. Dolby Vision technology found support only on the SR7011. Only the SR7011 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 SR7011. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the SR7011. The setup assistant will help you configure Marantz SR7011.
Only the SR7011 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SR7011.
The Marantz SR7011 is better receiver in this comparison. Check Marantz SR7011 price