I've grown both AK47 and Kali Mist and personally don't think it is an either/or decision between the two. KM is more clear headed and energetic. Both are good for social situations but KM is better for physical activities like mt. biking because you can focus better. AK is also more psychoactive IMO. At high doses the KM will you get amped up and colors are enhanced like a good cocaine buzz. AK becomes more visual like a mild mushroom buzz.
I currently keep a KM mom around but have been thinking about running AK again, in which case I'd still keep the KM mom.