Probably neither. There would be issues of double jeapordy only if the conviction was reversed because of either insufficient evidence or gross prosecutorial misconduct. If it was simple error at the trial court level that caused the reversal, there should be no problem with a new trial on the old charges.
The judge is free to sentence him based upon the conviction, without reference to the earlier results which were set aside by the appelate court. (Setting aside, for purposes of this discussion, the whole issue of sentencing guidelines.)
Thanks for the info.