741 open case v 7 1/4 LSD

Hi everyone, any ideas which differential to use.

Engine is 440rb in A body with XE274 hyd cam 727 auto shift kit with 2800 stall, 17x8 wheels.

1st differential is 7 1/4 LSD 3.89 ratio.

2nd differential is 8 3/4 3.23 ratio 1968 C body 741 case open wheeler.

Apparently both differentials have the same pinion size.

I’m guessing spider gears are stronger in the 8 3/4

I’m on a tight budget so which differential would survive better?