The Onkyo TX-RZ900 vs Onkyo TX-SR343 comparison shows that these AV receivers have some important differences and common features. The TX-RZ900 has 7.2 channels amplifier and the TX-SR343 5.1 channels. Only the TX-RZ900 has a Dolby Atmos support. DTS:X is supported only by the TX-RZ900. We have evaluated both AV receivers, TX-RZ900 has an overall score of 7.5 out of 10 vs 4.3 out of 10 for TX-SR343.
The Onkyo TX-RZ900 is better receiver in this comparison - check Onkyo TX-RZ900 price.