the argument on hauby > tortoiss is moot if you don't have tripple melded pie body. You have to remember in order to craft hauby it costs easily 3x as much per synth. Also HQ'ing tortoiss is a piece of cake, I went 10/10 and then of the 10 hq's I got a tripple pie body among a few double crit power's and sold a few to make the whole process free. Hauby is a freeking bitch to HQ, making all those damn HQ ingots > rings is very annoying rather then:
ingot (low lvl synth)
shell(5-10k on wards hq)
boar leather (low lvl synth)
raptor leather (easy synth with at least 1 hq skin + hq alumen)