2:91 or 3:55?

I have both, but the 2:91 are in the assembled sure grip rear end and ready to go.
The 3:55 are in like new condition, but I would have to buy new pinion bearings and a new seal. (about 50 bucks) and set the rear end all back up again.
The rear end is an original 1974 8.25 with a Jeep Cherokee disc brake setup added.
The car is a daily driver, and spends about 75% of it's time under 55mph with 1-2 times a month at 75-80 for a few hours.

Every time I think I have made up my mind I hesitate again, which is really unusual for me.
What would you do, and why?

Thanks