i want to go vmware education but I can't decide which is better. 2 years ago i went to VMware vSphere: Optimize and Scale 5.1 . VMware vSphere: Optimize and scale VMware vSphere 5.1: Optimize and scale between 6.5 is there a difference? Which is top level education ?

or it is good idea go to VMware vSphere: Troubleshooting Workshop 6.5 .