Just finished reading the whole topic, but still couldn't find what I was looking for. It's said that hashrate in Linux is faster for newer cards, but how much faster? What are the hashrates for RX 470 4GB and RX 480 8GB in Linux and Windows? For Linux noobs like myself it'll take the whole day to read all the guides out there and setup a Linux system so it would be nice to know what kind of difference in hashrate is there before spending all that time and effort. 
I have not used optiminer on Linux. But if you want a complete guide on how to set up headless Ubuntu 16.04 with AMD gpupro 16.50 drivers, I wrote one of those.
At the end of the howto, just download and run Optiminer instead of Claymore:
https://blockoperations.com/build-6-gpu-zcash-headless-mining-rig-ubuntu-16-04-using-claymore/