What is the best German exchange for bitcoin?

As a seasoned investor in the cryptocurrency market, I'm constantly searching for the most reliable and secure platforms to trade my digital assets. With Germany being a hub for technological innovation and financial services, I'm wondering - what is the best German exchange for bitcoin? Are there any particular exchanges that offer a robust trading interface, low transaction fees, and robust security measures? Additionally, I'm curious if there are any German-based exchanges that offer additional features like margin trading or staking rewards? Understanding the nuances of different exchanges is crucial for making informed decisions in this volatile market, and I'm eager to learn which German platform stands out as the best for bitcoin trading.