I practically live in my large desktop planner. It is black vegan leather, letter sized.

This is the closest one available to what I have. And the price isn't bad for a planner. https://amzn.to/4wHrAFa

Since when I got mine, it was the first planner like this I had ever had, I splurged and also bought a Happy Planner (Big) so I had sheets to start with inside it. https://amzn.to/4vr1N2P

And the key thing to have with these kinds of planners is the 11-hold punch so you can add any paper you want. Although the punch is often the most expensive thing. This is the most affordable one I can find. https://amzn.to/4bDd3lv

I also paid extra to get metal discs, although the plastic ones work fine. I just wanted the extra sturdiness. https://amzn.to/4hdFvxU

I also use pen loops so a pen always stays with the planner. They are self adhesive and come in a five pack. https://amzn.to/30fREgz

Clear dashboards are useful for breaking up sections. These come three to a package. https://amzn.to/2YBC6mi

Tab dividers make the sections easy to find. This is a letter sized set of five. https://amzn.to/3uY9e43