I've never had any of these three myself. And I gotta say, from just looking at the photos, if all three toys were the same price and the same availability, then based solely on aesthetics alone, I prefer the Henkei one.
Granted as I already said in my original post, MP-17 Prowl is
the definitive Prowl. Just my DeLorean isn't working and I can't get it up to up to 88 mph to go to the future to get my Masterpiece Jazz. (Oh wait I don't have a DeLorean! doh!
)