But I also agree with GP that many words like this are chosen just to sound more impressive, in the same way that people say 'at this time' instead of 'now.'
The words are typically used in two different contexts, one more professional (utilize) and one more casual (use). The words can be chosen to hint at which context we’re in or shift the context locally if needed.
For example, a story about a group of drunk guys could say that one of them utilized a flat stone to dig, to add humour since we’re clearly not in that professional context.
Personally, anytime I see the word "utilize" it makes me think the writer is just trying to sound smart or "put on airs." For me it has the opposite effect that the writer is trying to achieve.
But «utilise» is almost always interchangeable with «employ», which almost always has the same meaning.