In simple tearms: (UX) Designer: Research + Design UI Developer = Design + HTML/CSS/JS
According to me, UI is something we see, UX is something that we feel.
A product development starts with UX followed by the UI. Both are essential for the product’s success.
Can you be more specific?
I would suggest that 95% of this is down to the developer and how much knowledge they have on what makes a good UI and UX rather than the platform it's on.