Nice comparison. I have to admit, I'm a bit disappointed the Alta was ranked the way it was, because it's extremely comparable to my new Stark. Maybe the Yamaha conversion is also just that good (but it looks like someone made it in their garage). I guess credit yamaha with a great frame and suspension, but I think the WP Xplore in my Alta has been my favorite of all time.
I will give the nod to the Stark on ergonomics. I'm incredibly happy with it so far and the rider position never feels wrong, no matter how far forward or back in the saddle I try. Especially the plastics. Sorry Alta, but those ribs are murder on my knee and I can definitely grip the Stark much better. I haven't had it long enough to really get used to it, but I've figured out the power delivery and front brake. Regen isn't as good on the Stark, but it's okayish.
Kind of a weird talking point is the tool kit between the two bikes. Man! I just can't get over how good the tools are in the Stark kit. Now I have enough tools to work on both bikes (Alta and Stark) as well as my KTM since they use mostly similar hardware, so I'm pretty stoked about it