For UPVC respraying: matt every time. UPVC has small surface inconsistencies that gloss exaggerates. Matt is contemporary and hides daily weather marks.
For kitchen doors: eggshell. Easier to clean than matt, more forgiving than satin, none of the gloss maintenance. The studio default for nine in ten kitchen jobs.
For kitchen islands as a feature: matt in a darker tone than the surrounding cabinets. Reads as a deliberate accent.
For front doors: gloss or satin. The door is a small surface, fingerprints get cleaned regularly, and a touch of reflectivity adds visual weight.
All four finishes cost the same to apply. Same labour, same prep, same coat count. The choice is purely about how it looks and how it lives.