Neither. But what type of skiing do you like to do? What percentage park/all mountain/ powder do you ski? Give me some details and I will give you better advice
The biggest difference will be in the flex. The Blends are a little stiff I am pretty sure, so if you want a more solid skis (i.e. bigger jumps) Go with the blend. If you want something a little more soft and flexy (jibbing) go with the K2
I wouldn't want either in sierra cement. Two of the softest all mtn skis you could get... I'd go with something stiffer for sure, like an overcooked noodle.