When I track guitars, I prefer to use amp sims (if the guitarist doesnt mind) so that we can track using the monitors, rather than head phones. I find it much easier to pick up on guitarists mistakes, and nit pick performances when they are done at a low volume.
then i just reamp later usually without the band present. sometimes its better not to let the band decide which amps to use for certain things. If they are adamant about specific amps being used, then fine, if not i would rather just leave them uninvolved.
If I had a big studio where I could have my cabinet isolated in another room, and we could hear the mic'ed up cab coming through the studio monitors better, than I would probably not reamp as much.