It makes sense comparing Yamaha RX-V377 vs Pioneer VSX-LX301 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha RX-V377 has 5.1 versus 7.2 for Pioneer VSX-LX301. Regarding power, then RX-V377 has such a W/Ohm ratio - 100/8, 135/6 when VSX-LX301 has a power of 100/8, 170/6. The THD is 0.09% for the RX-V377 but 0.08% for the VSX-LX301.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 192 KHz/24-bit for RX-V377 and AK4458 384 KHz/32-bit for the VSX-LX301. Only the VSX-LX301 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 VSX-LX301 has Bluetooth support. Only the VSX-LX301 supports Spotify.
Only the Pioneer VSX-LX301 has support for High dynamic range (HDR). Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The VSX-LX301 can scale the input HDMI signal, unlike the RX-V377. Dolby Vision technology found support only on the VSX-LX301.
The Yamaha RX-V377 has 4/1 HDMI inputs/outputs versus 7/2 HDMI connectors of the Pioneer VSX-LX301. The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The VSX-LX301 has a built-in phono stage for connecting a vinyl player. A voice control is not available. An ECO mode is only available for the RX-V377. Both RX-V377 and VSX-LX301 can be configured using the Setup assistant.
Only the VSX-LX301 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the VSX-LX301.