Which AdSense alternative for publisher monetization gives consistent income?

I'm looking for AdSense alternatives that provide consistent and reliable income for publishers. My priority is not necessarily the highest possible RPM, but rather a stable monthly payout and dependable ad fill rates. I'm open to both display ad networks and other monetization methods (like native ads, affiliate programs, etc.) as long as they can offer consistency over time. If you've had good long-term experiences with any networks or platforms, I'd really appreciate your insights. What worked best for you, and why?