Casio vs citizen vs seiko?

Hello, fairly new to posting on Reddit so bear with me on my question here.

I’ve just recently got interested into watches and have been doing some research on “budget” brands & have came across all these. I reckon my question is, what should I be looking out for when looking at different watches? Is it purely design, is it how the watches run, what makes one of these worse than a Rolex, or something prestigious? I understand Citizen has eco drive technology but that’s all I see differently really. Thanks in advance!
(Sorry if I said/did something wrong I’m new to Reddit & watches 🤣)