I am going to attempt to upgrade PHP to PHP 7 later tonight while keeping Ubuntu OS at version 15.10 for now. The performance increases of PHP 7 shaved several hundred milliseconds off of our page load time and lower page load time equals higher Google rankings which for businesses is very important.
Since many people use our site for development, I believe it’s also important to have the latest tools available for development purposes. No point developing for yesterday’s platforms.