I have both BTD and Gorgon, no pictures I'm afraid.
The BTD ones are typical BT quality maybe even a little cleaner sculpt than some of their other Germans, poses are a little static.I can't speak as to the accuracy of the uniforms unfortunately.
I love the Gorgon offerings.The sculpting reminds me very much of Artizans Germans so if you like AD you should like Gorgon.
Oddly I don't have and Brigade Gerbs.
hope this helps
edit There is a reason the Gorgon look like Artizan.Mike Owen is Gorgons sculpter LOL