When you start thinking about desktop virtualization, you have two great options in either XenDesktop or VDI-in-a-Box, but how do you choose? Is it a question of cost, size of the environment, characteristics and / or other factors? Kumar Goswami, VP for our VDI-in-a-Box product, briefly talking about this in a blog post / blogs / 2011/12/01 / citrix vdi-in-a-box-v5-east -maintenant- here-% E2% 80% A6-give-it-a-go /. He writes that "If you simply need to use VDI Viab. Otherwise go with XD with its offer FlexCast. "I think this is certainly a good summary and one of the key decision points. Aside from the choice between a single VDI offering and a FlexCast one, I want to discuss some other points here to compare the two products. Hopefully that sharing knowledge will help influence people in one direction or the other depending on their current situation
authentication -. both XenDesktop and VDI-in-a-Box Support Active directory and smart card. a key differentiator is that XenDesktop requires Active directory and is not supported in a workgroup. for small environments using a work group with no central directory, VDI-in-a-Box can be the way to go since it also has the option of an internal user database. on the other hand, when using Active Directory with VDI-in-a-Box, the workstations must be explicitly assigned to users or groups that directly contain users. The use of nested groups and Active Directory groups for integrated desktop assignment would require XenDesktop. [UPDATE: As of VDI-in-a-Box 5.1, the use of nested groups and built-in Active Directory groups are both supported.]
Automation - XenDesktop provides an extensive PowerShell SDK interface that allows administrators to automate tasks such as desktop creation, site configuration, and metrics collection . VDI-in-a-Box is all about simplicity, wizards, and keeping the setup work and configuration options to a minimum
Configuration and maintenance -. As expected, VDI-in -a-Box installation and ongoing maintenance is much less complex than that of XenDesktop. Certainly XenDesktop not have the rapid deployment option in which all components (license server, database, controller, consoles, etc.) are installed on the same system and a wizard guides you through the initial setup; however, this is only suitable for environments PoCs and smaller because there will be a limited scalability and no redundancy
HA -. Both XenDesktop and VDI-in-a-Box provide high availability options at multiple levels. The two shared storage medium and redundancies in connection to the environment. XenDesktop has additional considerations for HA on the database; However, while VDI-in-a-Box uses local configuration files on each host, as opposed to a central database. VDI-in-a-Box also the HA capabilities built into the product without additional requirements apart from the addition of two or more hosts to the grid
Scalability -. Initially, you may think that XenDesktop is far more scalable than VDI-in-a-Box and it's not exactly the case. VDI-in-a-Box has been proven in customer environments serving thousands across eight workstations or more hypervisor hosts. I would venture to say that this is enough for most companies out there (keeping in mind that it is for a single deployment and multiple deployments can be created as needed to accommodate more users and / or different GEOs ). If you need a single deployment serving tens of thousands of desktops, XenDesktop could prove to be the best option
Cost -. I will not get into the nitty gritty details here. In short, if the cost is a key factor for you VDI-in-a-Box is the way to go. The necessary infrastructure, configuration and maintenance costs will be lower than that of XenDesktop
HDX 3D Pro -. If you have specific needs to provide high-range graphics accelerated workstations, you may want to consider the HDX 3D Pro feature available in XenDesktop Enterprise and Platinum editions. See http://support.citrix.com/proddocs/topic/xendesktop-als/hd-3d-about.html for details
policies -. Both XenDesktop and VDI-in-a-Box uses the same engine HDX wide policy that all policies will apply to VDI-in-a-Box and VDI-in-a-Box requires political set up and stored in active Directory. XenDesktop allows policies to be configured and stored in the database of site data (for when you can not have control over AD) while VDI-in-a-Box allows you to configure / disable options to the virtual channels in the product.
Well, that's about all I can think of for now. Please let me know if I missed any key issues here and what are your thoughts on the subject. Until next time, stay virtualized ... 
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