Can you explain the advantages and disadvantages of wigs with skin top, partial skin top, and non skin top, please?

Some hairstyles that are smoother or longer tend to lay flatter, showing the partings.
That's why the need for a scalp that looks natural.
Those scalps, while beautiful, are usually on a slab of rubber though and can add to the discomfort of wearing a full wig.
If your style if fuller and doesn't show a parting, you can wear a more open weave wig. Not only are they cooler but you can use a crochet hook to pull your natural hair through the openings to achieve a highlighted look or just to make it more secure feeling.
All these variations in cap styles and hairstyles really just add to the fun and the choices.
I hope that helped.:}