guyver wins hands down. any damage gohan inflicts would heal right away or over a few minutes. even 1 lense of the mega smasher would stop the Kamehameha. plus we havnt went into detail about the guyvers over weapons. plus if the control metal is removed d host would be eaten alive by the armour and then the armour would turn into a creature (which d control metal keeps in check. type in death of the guyver on youtube) plus the control metal would re-create the host from the smallest genetic material, i.e blood, tissue, muscle any kind of genetic material really