Looking at Citrix Certification

Hi All,
I have not done anything with Citrix for about 7 years with my last CCA been in MPS4.
I am wanting to get back into this but need some guidance on where to start.
Should I look to start with XenApp or XenServer?
What is the easier or more approperate certification and learning path.
Thanks everyone
I have not done anything with Citrix for about 7 years with my last CCA been in MPS4.
I am wanting to get back into this but need some guidance on where to start.
Should I look to start with XenApp or XenServer?
What is the easier or more approperate certification and learning path.
Thanks everyone
Comments
In progress: MCSA (70-290 & 70-291), CCENT, CCA XenDesktop 5
Blog: www.network-node.com
Also, when you say just a bit of experience for XenServer, if I installed this at home and used / tested this do you think that that would be enough?
Thanks again
But I have purchased "Getting Started with Citrix XenApp 6.5" to get me moving on the XenApp learning and the exam.
When you have a comment that experience should be enough for XenServer, how much do you think is needed?
If I install and test this for a weekend on my home computer would this give me some understanding that could lead to exam pass or will I need to get onto this in an enterprise environment?
Thanks all