To blockchain developers, how do you test blockchain security?

So I am working on this blockchain IoT project to put it on my resume and to compare it directly to Centralized Network Architecture. So essentially comparing P2P to Centralized. The main objective is to be able to showcase how the security on the blockchain (decentralized) is superior to centralized architecture, which is the most common architecture used in indoor IoT.

While I understand theoretically why and how decentralized is superior to centralized when it comes to security but I don't understand how I can showcase that in the practical and physical world. I mean I am no hacker and don't know one either, who can help me showcase it.

So as a developer, how can you test/showcase the security of blockchain technology?