Creo.
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I learnt with Pro/E WF2. Lost touch. Came back to Creo.
Was intrigued by the new interface.
2 year back, went through the process of forcefully reinstalling WF2... Creating a virtual machine, restricting the VM to 4Gb RAM, Installing 32Bit XP in the virtual machine, then WF2...perused the interface, (my old workmate) modeled a bit but drawing environment was just hell No! Not really worth going back. Creo is neater.
I have made a GrabCAD user group for Pro/E users.
https://grabcad.com/groups/ptc-pro-engineer-users
Since Creo was never ported to Linux, so I still run Wildfire 2 on it. It wasn't easy to get it to run on a modern system!
Just to comment, PRO-E Rev. 14 or 15 was my first version, than I changed to Wildfire 2, to CREO 2.0, CREO 6.0 and to CREO 9.0. From my point of view Wildfire 2 was one of the best Version. Moreover from my point of view a worst step was to change from CREO 2.0 to CREO 3.0, I changed back immediately.
The solution with virtual VM machine works very good, because Windows 7, or Windows XP has got necessity to provide operation system for former PRE-E Versions.