crit, no mater what, will be always the best because it ( increase critical strike chance , and increasing critical strike damage ) if You ever played Diablo3/PoE where,- crit chance/ crit damage/, as attack speed/ were always crucial to increase DPS, then You would know how stats like this play with each other

two mods at once, thus single mod will be never better

to counter this you would want new materia that has for example, two stats ( inc dmg + as/cs ) at one materia