Studies by Facebook and Google show that people usually don’t use menu icons they can’t see. So all burger menu solution makes your interface cleaner, but at the same time – slower.
In general terms, the UX research and wireframing stage is about how the website or application works while UI is how it looks. Both these stages include work on successful interactions, but UX deals more with logic, connections and user behavior while UI stage provides visual representation of all the concept. It means that ideally designer should first work on UX part with concentration on layout, making it more powerful, thought-out, clear and easy to use. Without this vital work you highly risk creating pure mess out of the user interface.