at what should i enchant my main nuke +element or +power? i am thinking of power but i am not 100% sure so lf opinions.

element

lol

ofc power

Why would you go for power on GF ?

rather why would u go for element if its gonna change nothing against ppl with attributes...?
rarely ppl have over 190 resists.... so +element will change nothing

300 weapon should do the job.

300 weapon + 20 base nuke attribute + 20 from seed = 340 attribute
so we would have to min 191 of resist to that attribute to make element enchants useful
usually its 120 in armor + 20-50 from buffs = 140-170 so our element enchant will simply change nothing

U know there is no threshold for damage right?

20 basic value +50(=70) at +30 element enchant, 140-170 attri defense with buffs but lets not forget about attri vortex / surrender that decreases the attri defense + remove the buff (talking about surrender). However, neither element vul is a bad choice, imagine +30 vul / +30 surrender(same route). I find power last route to enchant on GF.

element vulnerability

lol elemnt vulnerability at some secondary nuke i need big dmg at my main nuke,not lower their rezists.i will go for power probably)ty for opinions.

Element vul decreases opponent's element defense, less element defense > bigger dmg on your side. As I said, element vul + surrender(enchanted on the same route) is quite nice combo (in case you play with an elemental nuker).

I said you the best...go for you need!

as long as ur enemies dont have over 190 defense attribute, enchanting nukes for anything else than power is sooooo useless
and even if u enchant ur nuke for element, use vortex and surrender u wont go over 300 attribute difference so again its useless
the only smart choice in gracia final is +power