I have translated the text from French to English. Hope I understood the question correctly
There are several limitations with the simple installer. These include the following:
1. Simple install deploys vCenter Server to the C:\Program Files\VMware\Infrastructure\ directory with no
option to change the destination folder. Many customers prefer to install their applications to a volume other
than the system volume.
2. Simple install provides only the vCenter Single Sign-On deployment option of “vCenter Single Sign-On for
your first vCenter Server.” Therefore it cannot be used for additional vCenter servers.
Use cases for using the custom install option instead of the simple install option are as follows:
1. To distribute vCenter Server components across multiple virtual machines
2. To change the destination folder of a given component
3. To deploy multiple vCenter servers, extending the vsphere.local security domain
This is based on http://www.vmware.com/files/pdf/vcenter/VMware-vCenter-Server-5.5-Technical-Whitepaper.pdf
The disadvantage will be related to managing multiple VM's.
