I have made a short benchmark comparison of Parallels vs Fusion 5.0 HERE. VMWare Fusion has reached version 5.0.3, but it looks like VMWare has become lazy and those updates are not worth mentioning. However Apple released Mavericks recently, with an updated graphic stack which has slightly better graphics performance:
|Primary hard disk:||7.7||7.7|
Moreover, VMs seem to boot much faster under Mac Os X Mavericks.
N.B. you need to update VMWare Fusion to version 5.0.3 in order to have the best experience in Mavericks (or install VMWare Fusion 6).