*So pictures are supposed to go here to look at stats, but I figured it's easier to just write them down* (Sorry Foxy)
Two builds @ Lvl 90:
Con 5
Str 50
Int 405
Agi 5
AND
Con 140
Str 50
Int 270
Agi 5
Equipment: 8x Armor, 89 Quoit, 88 magic ring, 82/85 magic jewels, all store bought.
Int build:
HP: 1830
MP: 8162
Matk: 3793-5121 (avg: 4457)
Pdef: 457
Mdef: 7797
Con build:
HP: 3180
MP: 6272
Matk: 2779-3752 (avg: 3265.5)
Pdef: 531
Mdef: 7613
I'm gonna say Con build is better for an extra 75% HP, versus the extra 35% in matk (or 150% of the weapon's matk close to fury burst terms). Stats were buffed with the lvl 10 mdef/pdef buff (I forgot to remove it when I first started.. oh well). That gave a 60% extra bonus based on armor pdef/mdef.