Large Diameter vs Small Diameter Driveshaft Question

Hey Guys and gals, I need your help.

I have a 66 Barracuda parts car that I plan to pull the 8.75 rear from to replace the 7.25 in my driver. The driveshaft connected to the 8.75 is much larger diameter than the one attached to the 7.25.

Is one better than the other? Seems like the larger diameter would be stronger but I'm not sure. I know I'll need to shorten the 7.25 if I end up using it instead of the larger diameter driveshaft but I'd like to just swap them and use the larger diameter if it will work OK.

I would very much appreciate any thoughts!!


Terry