No idea about the Crispi, but I've had the K-trek MT extremes for almost a year and really like them for the snow and cold days.
My feet seem to stay about as warm in the K-trek extremes as my Schnee pac boots and are a helluva lot easier to hike rough ground in. They didn't take as long to break in as my other K-treks I've had. I go with uninsulated boots once the snow leaves so don't wear them in mild temps.
I'd try both and see what your feet like.
