I watched a video by Chris Titus in which he encouraged everyone to install auto-cpufreq immediately since it does wonders for battery life on laptops.
He said it was superior to TLP and powertop auto-optimizations.
Has anyone actually used this for an extended period of time? Does it really work as advertised?
These are all wildly different tools you've mentioned. I'd read up a bit more and understand what you need for your system. If you have an AMD CPU, the amd-pstate driver in kernel 6.6+ is supposed to give better power management capabilities than any other tool. This is a rapidly changing area of concern though, so that opinion may be changing month to month as TLP makes changes to take AMD kernel upstream changes in to consideration.