Which one?
The Monogram belt goes well with most trousers/outfits: black, brown, beige, dark-coloured denim.
For light grey, white, coloured trousers and light-coloured denim I prefer the white Multicolour belt.
It really depends on the predominant colours in your closet, as well as on the dress-code in your office.
If I were you, I'd see how I'll style myself for the next month(s) and then I know which belt I'll need in the immediate future.