Wireframe VS actual mockup

Doing a wireframe first is good because it's done a lot faster than spending a lot of time on a high fidelity mock up. Imagine if you spent all this time on a mockup with a layout, colors picked out, and images, and the client ends up not liking it because of the layout.

Here's a good informational link: https://www.justinmind.com/blog/wireframes-and-mockups-whats-the-best-option/

I use to do sketches, for wireframming. Then I start to buil a more hi-fi mockup. It is faster and the client and teammates can see what you're thinking quickly.

Going by my own experience I like to start with a wireframe it's faster and you can make several in a short period of time. Wireframes are a blueprint and can give you an idea of where to start when you build your mockup. Wireframes can even be drawn out pretty quickly during the initial consultation with a client. A wireframe is more or less the "skeleton" of a website or product, it shows the basic structure. A mockup is the "muscle" and a more accurate representation of what you will be building. It will provide a color palette, text, visual elements like images, and just overall a more clear picture.
Going further a prototype will demonstrate interactivity, and functionality.

Here is a good resource: https://designmodo.com/wireframing-prototyping-mockuping/

I guess it really depends on your process with the client. I've always been on the process of meeting the client just to discuss proposal and signing of contract. For mockups, theyre just waiting for a final design. Thanks guys for your inputs.