Tried PixelExp and PixelExp+ 13.0, ArrowOS 13.0, and CrDroid 9.2 on my camellian. All work, here are my findings.
ArrowOS 13.0 is closest to stock with minimal if any mods or UI enhancements available. Also has the best battery life of all 4 roms. Doesn't have per-app volume control.
Pixel Exp 13.0 looks and feels like a Pixel phone (launcher, wallpapers, icons, fonts, bootanimation) with no mods available. Very heavy UI. Worst battery life of the 4 roms. No per-app volume control. Slightly laggy UI compared to Arrow and CrDroid.
Pixel Exp Plus 13.0 also looks and feels like Pixel phone. Minimal mods available (statusbar, lockscreen, homescreen). Heavy UI. Slightly better battery life than PixelExp, but worse than CrDroid and Arrow. No per-app volume control.
CrDroid 9.2 looks and feels like LineageOS. Comes with a separate section for all mods and UI enhancements. More smooth UI than Pixel Exp. Better battery than Pixel Exp. More UI mods than Pixel Exp. Also has per-app volume control. Only Arrow has better battery and smoother UI, at the cost of UI mods.
TLDR:
Battery life: Arrow > CrDroid > PixelExp+ > PixelExp
Speed: Arrow > CrDroid > PixelExp+ > PixelExp
UI mods > CrDroid > PixelExp+ > PixelExp > Arrow
Base UI > PixelExp+ > PixelExp > CrDroid > Arrow