+str will not give u !@#$%^&* dmg with hitting on skills :P only little
and dye for exp ofc yes +dex and +str coz on low rate u will just hit normal not with skills .. i think xD
on pvp check what what u like more ofc +str gives u more chance for skill mastery and if u play on il its rly big chance usually..
but yes i heard opinion about -str didnt check it but not "retarded idiots" writed it
but rly check better what u like more for pvp and how it goes on your server :)