A Question For The Postal Stationery That Present In Thematic Exhibition

Let's use private stationery of Bayern as an example.
Is there any rule to say that it's better to use used private stationery for thematic exhibit,or it doesn't matter wether it's unused or used?

There is probably on rule as such although individual competitions may have some.

Are the rest of the items mint or used
Does the postal marking add to the story in any way
Is mint or used much rarer one way or another and does that matter

I am sure that there are other considerations I have not thought of.

AQ

I,first of all, do not exhibit my postal stationery, but find that both unused and used have their place in exhibitions. If, for example, you are showing the trend of a particular country in what they issued over a period of time, unused would seem to be the way to go, as they are usually in better shape physically. If you have some exhibit based on usage of a particular region, I would suppose used would be the way to go. I would think a combined display with say Bayern beginning of issue to say 1900, with examples both unused and used tied together would be a way to go.
There are subsets you could go off on, like Railway Post Offices or Travelling Post Offices with examples and maps that the cancelled (used) stationery cancels would show. Or, if you wanted to show a particular subject (king or other subjects) a mint collection with a smattering of used would work.
The object of exhibits is to show something specific in a limited number of frames. The more complete the subject, the more "points" you earn.
I hope this may have helped. I tend to ramble. Good luck.

The general rule in thematics is that mint is preferred to used, at least for stamps. It isn't as explicit for stationery but unless the postal markings themselves further the topic, mint is probably better.

I'd note that the use of private stationery in a thematic might be questioned in the first instance under the judging manual. But this may be a definitional issue - if it's stationery that was prepared by the government by personal order, it would be OK. If it's something purely privately produced "after market" I don't think you could rely on the privately prepared portion as a thematic element. (for the same reason that first day cover cachets aren't considered thematic elements).

Thanks friends,very helpful