i have a barbarian, should i do all strength, or 120 dex and rest strength. which is the better rout?

Depends on what weapons you like to use, you can see weapon ratios here; http://ladderslasher.d2jsp.org/index.php?g=3

Although I doubt it makes that much of a difference if you follow the ratio or not, so you can go full strength. Dex would be a complete waste if you use Clubs.

I would be using swords

Either go full strength or 75% str 25% dex then

thanks man