Can't really do the rating out of 10 for you, no base rating :p But I can answer your questions. Vocal dynamics go to the 3.Ai in this case. They can reach much higher than the 4s while maintaining the lushness the 4s offer. Instrumental detailing goes to 4.Ai however, separation is really a toss up. Separation is a weird one. They both do separation, however,the 3.Ai offer a more artificial sound stage. Although it's wider, some may not like the artificial one created by the V-shape.