Paranoid Android:
It is one of the oldest custom ROMs in the world of Android. This custom rom was extremely popular during the time of Android Jellybean, KitKat. The only specialty of Paranoid Android custom ROM is its stability and performance. Yes, just like the Pixel Experience, in this ROM you will not find many extra fancy features and thousands of customizations. You will get only those features which are not bare minimum for a good user experience. However Paranoid Android is a CAF ROM. You do not need to know much about CAF at the moment, just know that the performance and animation of CAF based ROMs is very smooth and fast. If you use Paranoid Android, you never have to worry about the performance of the device. You will get the best possible performance from your device from Paranoid Android ROM.
You can call Paranoid Android as Pixel Experience ROM, but it will have much better Raw Performance. But you will have to wait a long time to get the new build and security patch update on Paranoid Android ROM. Unlike other ROMs, Paranoid Android does not release an update every month. You can expect a new build every 4-5 months. And the list of supported devices of Paranoid Android is also very limited. You will not find an official ROM for too many models except the most popular models of a company. If you don’t need any fancy features, just need stable performance, and at the same time if your device is fortunately on the list of Paranoid’s supported devices, I suggest, use this ROM without looking elsewhere. I myself am using Paranoid Android as the primary ROM on my phone.