Well,
I think the 5th gen max is built better than the MSP not the 4th gen. But if you put a suspension like the one in the MSP on the max I'm sure the build quality would feel like it does in the MSP. I'm all about suspension, therefore I like the MSP much better. I had bad luck with the suspension on my max, try different things with no success. Getting the MSP was such a releave.