I love the timeline feature for competitor ads, which lets me see how other advertisers are iterating over time. It's super easy to visualize search volumes and bid prices for keywords, making it a breeze to understand the data.

Bang for buck, SpyFu is a great option. While SpyFu does not give you nearly as much information and insight as Ahrefs and SEMrush (which are pricey). SpyFu is a great option for lower budgets. SpyFu is very user friendly and has a great dashboard display. It is great at giving you organic keywords that you can easily rank for and a great foundation for paid keywords. Another one of my favorite features of SpyFu is it makes it easy to compare yourself to competitors and learn from them.

Perhaps the best testimony is that my agency has used SpyFu since 2017. Every year our team reviews similar applications and every year they demand to keep using SpyFu. My agency uses SpyFu for both SEO and Paid Search and especially for research and spying on competitors Ads. We also send reports to our clients, which they greatly appreciate and helps with retainage. All of the tools are useful. Plus, they introduce new tools all the time. Strongly suggest you try it for a year. Easy to use and the best price out there.