I really can't take any kind of comparison between these particular franchises; really, if you're going to compare Guyver to anything, the best comparisons would either be to Animorphs, or to Assassin's Creed. Heck, Assassin's Creed already has the ancient conspiracy and secretive shadow-war - the Templars and their war with the Assassins - and Animorphs has the mind-control by outside forces - in their case, the Yeerks.
Really, I don't see why you even thought to compare them in the first place.