What each of them have different? NEW https://nascompares.com/answer/synology-4-bay-5-bay-nas-range-compared-which-one-is-the-best-ds420j-vs-ds418-vs-ds420-vs-ds923-vs-dva3221/   DS420j vs. DS418 vs. DS423 vs. DS420+ vs. DS423+ vs. DS923+   DS420j – Good for multimedia, but limited to one or two things running simultaneously DS418 (replaced by DS423) – Good for multimedia using Synology Apps (h264 + h265 support) DS423   Good for multimedia using Synology Apps (h264 support) […]