Transaction cost variations in one contract vs multiple contracts

Question

Let's say I want to make a Blockchain application having three entities - Owner, Tenant and some object to be a Renter. My question is - Should I make a single universal contract for all the three or do i need to make separate contracts for each of the entities?

While working on Remix IDE I observed that the total transaction cost for 3 contracts is lower than when i include all into one.

Answer 1

You are free to choose whatever works for you. It is preferred to use different contracts solely coz of the fact that it would be a huge problem if one makes a mistake in one contract but deployed all 3 as one. And as you said, 3 contracts are even cheaper, then you have your answer!

Basically it's like uniting 3 web application into one monolith application vs having couple of services. A service always wins!