I'm still searching for a C10, and often come across I6 manuals. My 56 had that setup and I loved it, but gear ratios made driving distance tedious and not with amazing mpg. And my experience moving shifting from the column to floor made me prefer keeping things on the column. But then, I'm sure this had more to do with our less than proficient work in making the transfer.... back in the day.
That aside, I'd still rather keep it on the column to keep the floorboard free. It's also been suggested that fewer people can steal a column shift vehicle these days.