An affordable AV receiver is always a good option to consider, so Onkyo TX-RZ710 vs Denon AVR-X4000 comparison definitely makes sense. Both have 7.2 channel amplifiers. Only the TX-RZ710 has a Dolby Atmos support. DTS:X is supported only by the TX-RZ710. We have evaluated both AV receivers, TX-RZ710 has an overall score of 7.5 out of 10 vs 7.6 out of 10 for AVR-X4000.
The Denon AVR-X4000 is better receiver in this comparison - check Denon AVR-X4000 price.