I have been running 5 regular G2H cameras both indoors and outdoors under my roof for a few months already. I have now added 3 more G2H Pro cameras to my HomeKit system.
I do not see much difference between the two cameras when it comes to image quality. Dimensions are pretty much the same and so are the mounting options. Night light images are also very comparable. Both cameras use the micro USB port for charging. Both cameras can act as a hub for sensors such as door sensors, motion detectors, etc. The G2H Pro can handle more child devices but even the G2H can handle a large number of them. However, there is a downside with the G2H as I will elaborate below.
The big difference between the two cameras is that the G2H Pro exposes the Security System to HomeKit. See, the G2H camera also has a security system that is exposed to Aqara but not HomeKit. So assuming that you have an M2 or M1S hub, whenever these hubs get triggered for the alert, the signal is also transmitted to the cameras assigned to the same house. So, all G2H cameras start playing the siren sound. However, when you disarm the M2/M1S hub, sometimes the G2H camera keeps playing the alarm. I can only imagine that this is some kind of bug but it is very annoying. You would have to either use the Aqara app to turn them off or basically unplug them from the wall to have them shut up. Since I also have cameras mounted outside, I cannot have them play a siren indefinitely, especially when I am not at home.
Once the G2H gets trapped playing the alarm, there is no way to turn it off from HomeKit since the security system functionality is not exposed. So in the Aqara app, I was forced to assign the cameras to a separate house, this way the G2H cameras do not play the alarm whenever the hub alarm goes off. Instead, I have installed a dedicated and very loud horn that gets triggered by a switch. This leads to the downside of this approach. Since the G2H cameras are assigned to a separate house, they also do not function as a hub. See, any sensors that get triggered through the camera is not visible by the M2 or M1S hubs. So I ended up adding all sensors to the hardwired M2 hub and do not use the hub functionality on the G2H cameras.
The G2H Pro basically fixes this issue. You can now put the cameras on the same network as the M2 or M1S hub, and the camera will play the alarm sound together with the hub, but it will also turn off the alarm reliably. Now, I haven't tested it long enough yet so I will update this description if I run into more problems down the road. But it is safe to say, that since the security system is exposed to HomeKit, you are able to turn it off from your phone remotely. There is also a small advantage when it comes to the default ringtones. The G2H can also play a few ringtones, but it does not have the same capability as other hubs or the G2H Pro. Most notably, there is no doorbell sound on the G2H but there is on the G2H Pro. It is also possible to trigger playing the alarm through the Aqara app, whereas on the G2H the alarm sounds are also handled as ringtones.
If you live in a small apartment or college dorm and need a very simple system, the G2H Pro is all you need. One camera can cover the entrance door, and it can also act as a parent for the child sensor devices such as door sensors or motion sensors. It can also trigger to play the alarm and notify you through the phone. So you basically don't need to buy another hub. The G2H cannot do this and requires and external hub for the alarm functionality.
Finally, there is one more downside with the G2H Pro vs the G2H. The G2H Pro does not include the USB power plug, whereas the G2H does. So they basically make the install process more annoying just to save a buck. I would still recommend the G2H Pro as long as the price is close enough, just don't forget to order a pack of USB plugs with all the cameras. Overall I think the G2H Pro is still the best camera for HomeKit right now.
