I am an architect as well, and I bought Octane as soon as it came out. I am very pleased with it now. They keep the software updated and have a lot of plans for the future. It's constantly improving.
You can achieve unbiased lighting with ease, which works fine for us who don't have time to spend in tweaking lots of parameters to get a good looking GI. Plus, you only need one powerful GPU instead of changing all the hardware to upgrade your PC.
Another great solution is Corona renderer.
M.