Hitting the accuracy cap is more important than anything else, even if you have to give up other stats. Judging by your gear, I'd assume you're on A6S, so 676ish accuracy (688 for a7s).

As for comparing individual pieces, use the following weights (credit goes to dervy).

WD - 12.668
str - 1.000
crit - .228
det - .176
ss - .137

That means crit is roughly equal to .228 of 1 str. To use the pants for an example -

220 pants - 111 str + .228(70 crit) = 126.96
230 pants - 121 str + .176(71 det) = 133.5

So the 220 pants are worth approximately 127 str where as the 230 are worth approximately 133.5 str. 230 arms are similarly an upgrade, while both also give a bit more accuracy.

So to give a suggestion (assuming you raid) I'd upgrade both your arms and legs, using two crit materia in the legs and one crit/one acc in the arms. This will give you enough accuracy (with pipira) for a7s. I'd use the 240 earrings, they're better stat-weight wise.