[Freesurfer] mri_glmfit-sim for longitudinal pipelines

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Hello FreeSurfer Developers,

I'm attempting to compare longitudinal cortical thinning rates (pc1) between 3 groups using mri_glmfit using FreeSurfer 6.0. The tutorial suggests that you could use the multiple comparisons corrections that come with it but does not comment on using the mri_glmfit-sim option.

I just want to confirm whether there is anything prohibiting me from using mri_glmfit-sim. Are there any set of parameters that should be set differently when using pc-1 instead of thickness files?

Also, would you do a stricter correction and stick to the longitudinal model or prefer the linear mixed effects model and do a FDR? How do you decide between the two?

Thanks! Swati