i think Damier would stand the test of time the best (most durable, and very versatile). Mono would be good as well.
i have two pochettes, one cerises and the other Cherry Blossom (see my sig). i love them both but with the CB you have to be somewhat careful as the blossoms can rub off with use. The Cerises one (since its' basically like a mono pochette but with cherries painted on nit) is more durable it seems. Also, they're both kinda "cutesy" so may not be suitable for everyone. i'm thinking of getting a damier azur pochette at some point, so i can have one with a more conservative look