If u are wizard, i think u get some changes in damage log.
read he's a sin.
on topic:
as far as i know from my barb, 2 atk lvl 10 str ornaments didn't really make any difference in aps over 20-22 str ornaments, so if you're aps on sin i don't think it would make 2 much of a difference, dph? maybe if you can hit your spike dmg often, then it would make a difference, tiny one, but still it's a difference.