It makes sense comparing Marantz NR1710 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 NR1710 has 7.2 versus 2.0 for Onkyo TX-8020. Regarding power, then NR1710 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 NR1710 but 0.03% for the TX-8020.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/32-bit for NR1710 and 192 KHz/24-bit for the TX-8020. Only the NR1710 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 NR1710 has Bluetooth support. The Marantz NR1710 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Only the NR1710 supports Spotify. Only the NR1710 provides HDMI signal transmission in standby mode. The NR1710 can scale the input HDMI signal, unlike the TX-8020. Dolby Vision technology found support only on the NR1710. Only the NR1710 supports HDMI Audio Return Channel (ARC). The HDMI eARC is available only on the NR1710. Of the two receivers in our comparison, HDMI CEC is present in only the NR1710. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the NR1710. The setup assistant will help you configure Marantz NR1710.
Only the NR1710 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the NR1710.
The Marantz NR1710 is better receiver in this comparison. Check Marantz NR1710 price