Although they are aimed at different aspects of Low-Quality Websites, Panda and Penguin often work together...
With Panda designed to tackle substandard content and poor user experience, and with Penguin punishing low-quality link profiles, the two algorithms often strike hand-in-hand. In fact, the same websites publishing poorly written or templated content will frequently also be caught for building links in an unnatural or manipulative way. Sites affected by these black and white beasts face a serious drop in traffic and revenue, though not normally as severe as those inflicted by a Manual Action.
The road to recovery with these algorithms tends to be a long and hard one, requiring a deep understanding of Google's Webmaster Quality Guidelines by those supervising the remedial works.
After well over a decade as part of Google's front-line Webmaster Support Infrastructure I have personally dealt with more Penguin and Panda issues than most large SEO Agencies have. As a result, I am able to expedite the remedial process considerably, and to guide your in-house team along the swiftest road to recovery.
To say I've seen it all where Panda and Penguin are concerned would be too much of a cliche.
However, I can safely say I'm more experienced with Google's Guidelines and Algorithms than most SEO Disaster Recovery Specialists offering their services to the World's Online Businesses. Contact me to see how I can help you.