I have both, Mono NF MM and Damier Ebene NF GM. Can't say which one I like better, it's all about preference, some days I feel like a small bag and others a larger one.
Trust me I have had all sizes and really love the Damier NF MM the most. I just got burned on a fake Roses NF MM (fleabay) and this sent me to the LV boutique and I found a new Damier MM that was Made in France and am thrilled with her I just sold the Mono GM as I only used her on a trip one time. I had the Murakami PM, very cute, but too small for everyday, so I have MM's and one Murakami GM, yet to be used...Sounds a bit like Goldie Locks!! It's a great bag!