We've used both within the last 12 months.
I can say I was thoroughly disappointed in the capabilities/development of the CS10.
To elaborate on that I was hoping/expecting that there would already be a seamless Mobile Service Tool application file that would allow us to use the Mobile Service Tool to tell the CS10 the wifi credential that it is to connect to, that is not the case, you either have to build that file/api yourself (very difficult) or use GUIDE to configure it, so ultimately it is not end user friendly, only good for the developers.
(In our use case wanted to have a CS10 on a mobile piece of equipment, then the end user would use their mobile device to connect to there wifi, that could be a fixed/known wifi or say their mobile hotspot, but programming it to do so is not a simple, It's not that easy it seems.)
The lag/latency was no different between the two, the thing to remember is that regardless of fiber/wifi or mobile network, the CS device still has to connect to the remote/cloud Danfoss Connect/Service tool server, then redirected to the device, so it is never a direct PC/Machine to CS connection, all traffic goes through the Danfoss server where ever that is.
If lag/latency was a concern I use (installted/on/local to the machine) a PC/Nuk with GUIDE software installed and the CG150 connection at 1mbps, then I would us a RDP/VPN connection to the PC/Nuk to work direct from machine to machine in real time.