I've read the FAQs and there doesn't seem to be any consensus on this choice. Some say Gaea Rage criticals more and is worth the higher HP cost, some say even though it does more damage it doesn't critical as much and therefore isn't as good as Deadly Fury. What do you guys think?
"Expect the best out of yourself and try to put up with everyone else." ~ Ragik
Honestly I find the HP costs for both a bit too high so I just use my allies to kill the enemy with mass hitting techs because if the foe survives you have a pretty good chance of dying unless you have masakados (or you're fighting Surts with a void fire magatama).
Deadly Fury has a high critical hit rate, if there are a couple enemies on screen you should critical most of the time. I find that the extra press turns tend to make up for the lower damage than Gaea Rage. I don't remember Gaea Rage critting a whole lot.