Choosing the right bridge

When you have a bridge that came with your first Zigbee lights, then the choice is probably already made for you. But if you want to choose first, here are some considerations from my end that might help you choose. This consideration are based on this moment, September 2017, I am sure time will have some surprises still for us.

The Philips Hue Bridge is proven stable, supports few sensors and lights. There are several apps for this bridge to be found, so you can do a lot of controlling with phone or tablets when needed.
In Europe you'll find that some other brands of lights, like Osram and Ikea (with update) are supported on the bridge as well. In the US these are Ikea, OSRAM, GE and CREE Connected LED Bulbs. There is up till now one major disadvantage on the Philips bridge. The use of sensors i.e. a motion sensor is kept internal. External apps, like the JowiHue plugin has to poll the bridge to see if a sensor changed its status. The plugin is doing very good with that, but if a sensor chages state, it can last anywhere between 0 and 2 seconds (this is depending on the polling settings) before an event can be triggered. It depends on you as an user if this is acceptable or not, some don't mind others do mind - especially in larger networks.
Some functions, do need the help of the Philips Hue app.
The maximum numbers of devices on the bridge can be 63, where Philips advices not to go over 50 devices.

The ConBee and RaspBee gateways with deCONZ interface are currently in development but already very stable, and new functions might come available still. It is very comparable with the Philips Hue Bridge, it even shows up as Hue bridge on the Philips Hue app. It also comes with Phoscon, a webinterface, which you can use on any device. Where Philips has shown to be relucting to support devices from other brands are the deCONZ gateways aiming to support all that follow the correct Zigbee3 (HA 1.2) protocol. For a more or less current overview, go to their compatibility page Noticable differences with the Philips Hue Bridge are websocket support, enabling fast, direct response for events in HS3 and more control of the colorloop.
The maximum number of devices on the RaspBee/ConBee gateways is 200.

Choosing between RaspBee and ConBee is depending on your needs and possibilities. They are the same, where the ConBee as a USB device is very usefull to run on an PC with Windows, Linux or Mac and could be used on the same machine as HS3 is already using. The ConBee will be usefull in larger installations because the CPU power of the server is fully available if needed. The RaspBee can be delivered as ready installed RaspBerry PI device, or as shield to be used in an exisiting RaspBerry pi. The RaspBee has been tested up till now with more then 60 lights and several motion sensors and taps connected. In this configuration the load was still very good, CPU at 7%. It can be expected that this device can hold larger installations as wel.