Platinum Egoiste smells like plant sap, a little similar to Mugler Cologne. Has a sharp note which some people might find irritating though.
Chanel pour Monsieur is one of the best chypres around. Starts with a citric top. After the topnotes are gone, it smells like an aged, yellow piece of paper.(not a bad thing!) There's a wonderful petitgrain note in there which gives it a sweet-bitter leathery scent. One of my favourites
You'll probably like Platinum Egoiste since it's a fresh fragrance, like the ones you already have. But if you want to try something different, Chanel pour Monsieur is your ticket.