I prefer the syn shape and color, thats just a personal thing though.
I've always wondered why more people haven't played around with both crosses. I personally feel that any project involving back crosses to either parent species is well worth your time, it's all about asthetics though. Which parent do you like the looks of the most?
I personally would love to see more work done with creating a better/fertile parrot type fish, something king kong, or mammon looking. Would also love to see a reliable form of "creamsicle" in parrot fish, Midas carrying that gene are readily available, it shouldn't be that hard. Definitely on on my "someday" list for projects.