At lvl 100 FotD Eddie has the following:
HP - 10938
ATK - 393
DEF - 931
MAGIC - 230
MR - 230
SPECIAL - 337
Using 3 Guardian (needed for guardian bonus) and 3 Iron build the bonus is as follows:
20% defense (186.20) + 15% defense for 2 iron (139.65) for a total bonus Defensive add of 325.85
Using Iron and Stone build the bonus is as follows:
15% defense (139.65) + 15% defense (139.65) + 1% HP (109.38) for a total bonus Defensive add of 388.68
I would expect the Iron and Stone build to be a bit stronger based upon bonuses.