Standard cost has the advantage that you can measure discrete variances I.e. at specific operations or for specific materials.
FIFO will just return a finished cost.
if that cost has a significant variance from your anticipated cost, tracking down the source of the variance is far harder to do.
If you have significant variances with standard costs, it is important to recognise that they are measured with the functional area and do not get rolled up into your sales margin.
Also, with standard cost, you can measure sales margin based on the sales function success rather than the sales function achieving or losing margin through no actions/fault of their own.
It really does depend on what drives your variances, how large they are and where you want to drive margin analysis as to whether Standard is worth the effort.