What type of chickens are best suited for an Omlet coop?

It is not really a specific breed that would be suited for the coop, rather their size. 

For our largest coop (Eglu PRO), we recommend having a maximum of 10 large chickens. More information about our coops, including how many chickens each one is suited to, can be found here - https://www.omlet.co.uk/chicken-coops/.