Tip # 2 Do not change the Universal Driver Priority Order: I have personally seen adverse effects if this order gets changed. An example of what could happen is that an entire Citrix application server might map the printers to a driver other than the Universal Print Driver and then subsequently negatively affecting users with your users printing. The only time I would change this would be if it directly relates to a Citrix support call.
XenApp 6 Policy recommended and default order
XenApp 6.5 recommended and default order
Go to Citrix XenApp Printing Tip # 1 http://24x7itconnection.com/2014/01/21/citrix-native-printing-basics-tip-1/
Go to Citrix XenApp Printing Tip # 3 http://24x7itconnection.com/2014/02/04/citrix-native-printing-basics-tip-3/
Go to Citrix XenApp Printing Tip #4 http://24x7itconnection.com/2014/02/10/citrix-native-printing-basics-tip-4/
Go to Citrix Printing Basics Tip #5 and #6 http://24x7itconnection.com/2014/02/18/citrix-native-printing-basics-tip-5-and-6/