It makes sense comparing Yamaha RX-V6A 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, Yamaha RX-V6A has 7.2 versus 2.0 for Onkyo TX-8020. Regarding power, then RX-V6A has such a W/Ohm ratio - 100/8 when TX-8020 has a power of 90/6. The THD is 0.06% for the RX-V6A but 0.03% for the TX-8020. Only the RX-V6A 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 RX-V6A has Bluetooth support. The Yamaha RX-V6A has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Only the RX-V6A supports Spotify. Only the RX-V6A provides HDMI signal transmission in standby mode. The RX-V6A can scale the input HDMI signal, unlike the TX-8020. Dolby Vision technology found support only on the RX-V6A. Only the RX-V6A supports HDMI Audio Return Channel (ARC). The HDMI eARC is available only on the RX-V6A. Of the two receivers in our comparison, HDMI CEC is present in only the RX-V6A. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the RX-V6A. The setup assistant will help you configure Yamaha RX-V6A.
Only the RX-V6A has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the RX-V6A.