Majestic allows you to compare huge URL lists. With its Bulk Backlinks Checker tool, it is easy to instantly compare large lists of URLs and see which are the most important. You can check up to 100,000 twitter profiles side by side, or compare a list of URLs on any given topic.
Majestic lets you see how your sites matches up against their competitors over time. You can compare up to 5 different domains at the same time and check which one had the most backlinks and look back over 5 years of history.