What architecture to choose client-server, thick or thin, server or without it?

Question

Computer networks

You need to choose:

• thin client
  
• or fat client
  
• server needed
  
• no server needed
  

Description of the objects that we must install the program and equipment:

• 
• Automation objects are located in different cities.
  
• About 50 automation objects
  
• The quality of the communication channel between them is incomprehensible: it can be good, bad (generally absent). Inside the automation object, the local network can be bad or excellent.
  
• The number of users on the automation object is from 2 or more.
  
• The size of the transferred files is not yet clear
  

please advise how to choose?

• thin client
  
• or fat client
  
• server needed
  
• no server needed
  

I am attaching an algorithm for choosing, I made it, at the simplest level. Please look, tell me what other questions and answers you need to ask for a choice

Answer 1

The quality of the communication channel between them is incomprehensible: it can be good, bad (generally absent). Inside the automation object, the local network can be bad or excellent.

It is impossible to answer the question because of this point, it is impossible even to think on this subject.

Answer 2

We put the simplest PCs on win 7 \ 10 \ linux We deploy the necessary software on them, we prohibit sotal.
We put mini servers on each object.
We do data synchronization with the central server. Client > mini server > sync with CA (once every 10 minutes for example)
If you cannot guarantee communication channels, then the only way. Or preparing for downtime at the facilities when the Internet falls.
Bring the local network on the objects themselves in full order so that it works perfectly.