[Grammar] Difference in systematization of the documents and systematizing the documents

[Oleksii]

Please could you advise what's the difference between:
- "systematization of the documents is ..." and "systematizing the documents is ...";
- "creation of an purchase order" and "creating an purchase order";

and in what cases it's correct to use just a noun with of and in what cases it's better to use a gerund?

 

[GoesStation]

Welcome to the forum. Can you post some complete sentences showing how you want to use these phrases?

Note that an purchase order is never correct. The indefinite article is "a" except when the following word begins with a vowel sound when said aloud.

 

[Oleksii]

Welcome to the forum. Can you post some complete sentences showing how you want to use these phrases?

Note that an purchase order is never correct. The indefinite article is "a" except when the following word begins with a vowel sound when said aloud.

Thanks!
For instance I want to write the topic in the agenda of a meeting - "Systematization of the documents and preparing them for hand over".
Or I want to say that "creation of a purchase order has been completed".