Thanks for clarifying your question. So, if I get it right this time, we're talking about the design of the behind-the-scene stuff (code), regardless of the app

Thanks for clarifying your question. So, if I get it right this time, we're talking about the design of the behind-the-scene stuff (code), regardless of the appearance. Definitely, the code on the left appears to be a better solution. At least, since "your code is my hell", I'd rather be presented with the code on the left. But, as you know, there are ways to encapsulate the code on the right so that it is exposed just like (or pretty close to) the one on the left if you really need to.