Dana 70 vs 80
 

Hey guys I recently bought a 1996 12 valve 5sp 4x4. Its got a Dana 70 in the rear with 3.55s in it. My goal with this thing is it build something of an offroader so I've been looking into lockers, posi's, suspension ect... But I've been wondering is the Dana 70 worth upgrading or is it a better option to look for a Dana 80, which I have found some, none with 3.55s only 4.10s so I would have to swap it to a 3.55. Basically I'm asking is that worth it or is the Dana 70 good enough, and mine has no issues so far, only had the truck for several months but all good for now.
Thanks in advance.