Which trans is better for racing short tail shaft 727 or long tail shaft

Would be a weight difference between the two, with a long tailshaft trans requiring a driveshaft with the two welded yoke ends, a slip yoke, and the shaft tube. A short shaft trans would require a driveshaft with a reversed slip yoke, a seal, a male splined welded end, the shorter shaft tube, and rear welded yoke end. Obviously both versions use two u-joints. I've got a short 727 in my A100, drive shaft u-joint to u-joint is about 20", no carrier bearing, it's design is just as described above. A longer two piece shaft in a car would likely require a hanger/carrier bearing setup one would assume. Heavy duty trucks I deal with all have two piece w/carrier so I would say there's a good reason for that, stability and strength, definitely not weigh savings. For a car, using quality tubing and welded yokes with the long tail trans would seem the better setup. Just a guess.