Only reason to go for MM case today, would be a custom order. That is their main advantage, you can order your own panels and make something exactly that suits your needs. It is expensive though, so are their standard models, which are imo too expensive for what they offer (very simple design, they must be incomparably cheaper to manufacture than caselabs products, but yet they are often even more expensive).
As for the toolless design, thumbscrews ect. I wouldn't really take it as such disadvantage, that you for example have to asembly case that is shipped in parts. These products (both MM and CL) are meant for enthusiast market. Sure it never hurts if there are features that improve them, but really, average new owner of these products, will not have problems with using a screwdriver. We are talking here about people who sometimes invest few days just to route power supply wieres. If you want just put your gear into the case, in 10 minutes, you buy some cheaper maistream plastic/steel case (like cm haf) not a 500$ product.
Anyway I feel like MM needs to improve their designs, or drop prices if they want to compete against caselabs. Caselabs is not that well established yet, but it will going to change quickly. So far I don't really see a competition that could stand a chance, given the quality, prices and amount of new models. This is another great feature, that there are still new cases to be released, process of improving and expanding offer never stops.