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If you have till the end of the year, why not update all the components then?

That's most likely the way forward. Just get the VDI done, then worry about upgrading the infrastructure.

I would say. Upgrade, then improve the experience. There's huge amount of features with 2203, coming from a 1912 deployment. So improving first and upgrade after, seems a bit off.

Ok. That makes sense. I have to see what road blocks there are to going 2203 first. We have multiple environments and 2 data centers. I have to check, but I believe we could do an in place upgrade of 2016 server to 2203 LTSR.

Its OK to upgrade the DDCs and VDA only for what you are trying to achieve. Some features will require upgrading the catalog version.

What Rob says is important. PVS becomes your stumbling block. You can't update the PVS Device Target agent to a newer version than the back end PVS Servers, without experiencing issues. I haven't tried to see if the 1912 PVS Target Agent will play nicely with 2203 VDA, but I wouldn't take that path for production and support reasons. Always upgrade the back-end components first, then you are supported.

I have done many 1912 to 2203 upgrades. From 1912 flat or CU1/CU3 to 2203 CU2. The only thing that stuck out on these environments were virtual channel security policies. Some choose to doable it, some put in the virtual channels.

Thanks for the info about PVS. We rely on that. I'm not directly involved with that Citrix environment any longer, so I was asking to see what options that team has.