I migrated to arrow11 from arrow12.1 . It is not possible to use 12.1 because it is not compatible with applications with old api used for android 10. What I can write about arrow11? I used LOS so far but I looked for rom which will let to use my F3 longer. The LOS 18.1 is possible to work and use 0.4% of battery during night hour. The arrow11 needs only 0.15% for the same. I was able to receive the same result in LOS after kernel change , but it was not easy to find correct kernel, because result was not repeatable. The kernel build-in arrow is very good optimised.
LOS has some very usefull options, but life without it in arrow is possible.