I have been riding single speed for about a year and a half (with an old Raleigh winner has pipe special), and I have to say I preferred 32c.very wide for a fixed/ss
More comfort, and you can lean the bike over to a heroic angle, at least if feels that way. But I also found it to be a little faster, though acceleration from a standing start requires slightly more effort, but while rolling it's the same.
That being said, it's down to what the individual likes.