I don't own any Panzer Campaigns titles, but they tend to be more on the operational level: Battalions, Regiments as units. Each game title covers a certain operation, or campaign, in detail. They are 2D only as far as I know.
This Campaign Series here has to do with Platoons, and each game covers a Theatre of operations for a long period of time, for instance West Front covering European, Middle East and North Africa scenarios with OoBs from 1930s to early 1950s. 2D and 3D supported, although the 2D views of WW II titles (John Tiller's Campaign Series bundle) is quite small for modern standards.
The Blitz Wargaming Ladder has active forums for all these games; Squad Battles, Campaign Series and Panzer Campaigns (Tiller Operational Campaigns is the forum name there), so those fora might be good sources for further information, with AAR reports in many of them.
< Message edited by Crossroads -- 1/27/2016 11:01:40 AM >