It makes sense comparing Marantz NR1711 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 NR1711 has 7.2 versus 2.0 for Onkyo TX-8020. Regarding power, then NR1711 has such a W/Ohm ratio - 50/8, 70/6 when TX-8020 has a power of 90/6. The THD is 0.08% for the NR1711 but 0.03% for the TX-8020. Only the NR1711 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 NR1711 has Bluetooth support. The Marantz NR1711 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Only the NR1711 supports Spotify. Only the NR1711 provides HDMI signal transmission in standby mode. The NR1711 can scale the input HDMI signal, unlike the TX-8020. Dolby Vision technology found support only on the NR1711. Only the NR1711 supports HDMI Audio Return Channel (ARC). The HDMI eARC is available only on the NR1711. Of the two receivers in our comparison, HDMI CEC is present in only the NR1711. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the NR1711. The setup assistant will help you configure Marantz NR1711.
Only the NR1711 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the NR1711.