I may be way wrong but I believe this is related to functions like VAII. Personally I would go Enterprise... DRS is really your friend. You really want it if you plan on building a cluster.
Take a look at VMware KB: Frequently Asked Questions for vStorage APIs for Array Integration which explains the features that are available with VAAI.
ALUA and the integrated MPIO will work independently of the edition, you just cannot use 3rd party software.