What I've found between Open Pro and Sport is the consistency. With each Open Pro you can more or less guarantee that the rim itself is going to be true. This isn't the case with the Open Sport. You can get a brand new set that is totally fine and the next set is not quite as good. The join is another thing to consider. Much better join on the Open Pro and better finished. Worth the extra dosh IMO.
What I've found between Open Pro and Sport is the consistency. With each Open Pro you can more or less guarantee that the rim itself is going to be true. This isn't the case with the Open Sport. You can get a brand new set that is totally fine and the next set is not quite as good. The join is another thing to consider. Much better join on the Open Pro and better finished. Worth the extra dosh IMO.