Should Hue and Sonoff zigbee be on same or different channel?

[FriedCheese (Ryan)]

@Chrisalbertson

What’s best, both on 25 or move the Sonoff dongle to some other channel?

Separate channels.

@Chrisalbertson

zigbee and Wifi 2.5 GHz signals are using the same frequecy?

Use this visual aide.

For best performance, you want each ZigBee network and WiFi separated. For example, I have a Sonoff dongle with Z2M on channel 15, Hue bridge on 25, and all WiFi APs are on channel 1, 6, or 11.