You'll hear from me soon via PMIf you want me to beta test for you I volunteer my services!
First of all, 18.1 is based on Android 11 while 17.1 is based on Android 10. Then, my 17.1 has several optimizations, tweaks and improvements that are not present on my 18.1, but I'll gradually add them over the next months.Sorry for my English!!
Linageos 18.1 vs Linageos 17.1