I think those both sound really great! The 1100iS has more-pronounced bass, and less isolation thanks to its semi-open design. But the pads are larger in size, so some folks might feel they’re more comfy.
The MSR7 has more of a “neutral/studio” design, with less bass overall. It presents music slightly more accurately to how it was originally recorded.
It’s really down to your personal tastes in sound, as apart from those differences they’re very similar headphones!
If it were me I’d go for whichever one I could find for the cheapest price.