Well, really depends what you have in your environment as far as virtualization infrastructures. If you have all VMware ESX hosts environment and uses VMware View, it would be obvious you're give ThinApp a chance because it's doing pretty good in terms of single execution and you have the apps running without conflicts and its so light and easy to deploy. Now, if you have Citrix XenEnterprise and Xen Desktop, than using XenApp would be your best choice and Citrix is actually the king in application virtualization before Softgrid and ThinApp has to offered. I still think Citrix XenApp has more features to offered but that depends on your assessments. Now, Microsoft luckily bought Softgrid and rebranded to App-V for their VDI solution such as MDOP. App-V is a great product as far as packaging and sequencing goes, its very good solution for application virtualization. Now, for those newbies on the block, why would you try something that's not mature and widely deployed?
So, I would check out our existing infrastructures and how we going forward, but using VMware, Citrix and MS application virtualization solutions are solid. Also, you would have to test them in a lab to decide which one works in your environment because each entity have their own and specific applications needs and requirements. I could see Symantec has some chances with this market but it takes time though! If you still interested in discussion with me offline call me anytime we can talk bro. I'm glad we have same last name so great to share knowledge!
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Regards,
Stefan Nguyen
VMware vExpert 2009
iGeek Systems Inc.
VMware, Citrix, Microsoft Consultant