Overall I would say the Stunner rom is a better rom ; it is definitely slicker and much smoother than Midnote and Alba LP6 . There seems to be no serious major bugs - I have yet to find in Stunner roms. Midnote roms tend to have slight freeze issue once a while when you switch apps
However I am using Midnote due to its Spen functions and S Memo. Since yesterday night I have switched to Alba V1 ( LP6)  and just only half hour ago upgraded to Alba v2 ( based on LP6 ). Alba roms equally good as Midnote and it does not have those once a while freeze issues as Midnote 3.3. So far last 2 threads users already reporting issues but again I do not faced such issues - so I can say is bugs free for now

However if you read XDA threads, you will find varying comments about bugs on these roms. Frankly I do not faced those major bugs as reported - bugs are very minor and negligible
Example in Stunner before v5 - only minor bug I found was cannot change lockscreen wallpaper ( and is a reported confirmed bug by developer ). Reported Issues such as inconsistent sound volume, SMS ringtones not working, caller ID names cannot be displayed, gps issues, losing full root after flash , settings FC , gallery FC, gmail fail to work, playstore cannot buy apps etc etc - long list - I do not faced at all. That is why I give Stunner rom a 9.9/10 rom

Stunner is a way much better rom than Midnote. It is slicker , faster and smoother probably without those bloated Samsung apps/widgets and offers more customizations