Best ATS+CRM Software Recruiters Have Ever Used?

So, my HR friends introduced me to this software called Recruit CRM and guess what? I started working for them a few months down the lane. This is by far one of the best Applicant Tracking Systems in the market and with features like Kanban boards, hotlisting candidates, Boolean search, invoice management, top-notch sourcing methods, email integrations and various other customisable features, a lot of users from Bullhorn, Firefish and Zoho, have been shifting towards using Recruit CRM. However, I want to learn which is the best ATS you've used as of now? Also, do let me know what are some of the features you're looking for in your current ATS?