I don’t have scars or marks but I do have dark olive skin and I really like Ex1. It was developed by an Asian woman specifically for warmer/olive skin tones so it may well look ‘orange’ on caucasian or more neutral/cool skin tones.
Conversely IT cosmetics CC cream looks grey on my skin as the all the ‘tan/dark’ shades have totally the wrong undertones. 
I would go along and get a few sample pots and try them out on different days. Estée Lauder Double wear has full coverage and they use those little devices to give exact shade matching.