REVI Gunsight dilemma

I don’t know much about German gunsights and would be interested in the options of those that do or have an interest.
I may be wrong but I am guessing the revi MK16B night fighter sight would be rarer than the standard fighter sight?
For those that don’t know the 16B was designed for upward firing weapons as fitted to the BF 110 for attacks from directly underneath the RAF Bomber streams.
The reflector glass was removed and so probably a less attractive sight to look at.
What would be the most desirable to a Gunsight collector the possibly rarer but less attractive night fighter sight or the standard fighter sight?