The shifta thing on the crit one is probably the same as the support rolls, so it's mostly for the 4% extra def and 10% crit. They only get 1% more atk. I have it on Redran, but I'm going to get another one for Jinga. It seems like it'll be good in general for Su/Ph if you don't have anything specific you want to use.
I'm not really fond of the increased PP cost, but yeah, that one works well on Melon.