For sin the case is a bit different. it depends whether you want to simply get decent stats or get high aps. for just good sin chose dragon, as it was easier to get and more reliable, but as im aiming for 4 aps base im going to get dragon/r8 combo for dragon int bonus + r8 reshaped int stats. thats what matters if you are sin. for barb id go with full dragon refined + stoned untill i get good r8 stats that would overpower dragon in every way there is.