Frankfurt might be the closest solution depending on the location of your customers and the majority of your website's traffic. Make sure you are aware of where your users are experiencing your website the most and who makes the most use of your business. If your customers, for example, are located in the UK, our London location would give a much higher performance for your users, which will grow your business' success much faster. Although, if your customers are located in Germany, Frankfurt would be the best solution.