How to choose materia for each class?

[Llus]

I might have to rethink my build, but no promises on a crit build. The OCD control freak in me cringes at the idea of building on such an RNG-based stat.

Do run a crit build, because not only does crit affect the frequency of critical hits but also damage done when you do crit which is HUGE. Over a long fight it will be MUCH better than det.

Think of it like this:
if you max out your det and it gives you an increase of 500 every hit, then you max out your crit and you crit 50% of the time between 800 and 1200 extra your median increase is going to be around 600 with crit vs det
these numbers are pulled directly out of my ... um, well - but crit will give you a much better bang for your buck. SE's RNG algorithm is pretty close to a true random and over a long fight this does even out to better numbers with higher crit; my advice is to follow those guides and you will see your DPS improve quite a bit