All I can say is that I've always had successful conversions from TCP/GE QuickDesigner to Proface GP-Pro EX. I don't know what the conversion is like from QuickPanel to QuickPanel View or QuickPanel+.
Proface is the original equipment manufacturer of older TCP & GE QuickPanels (not sure about Quickpanel View and QuickPanel+ models).
GE's QuickPanel View is a mature product - Their recommended successor is QuickPanel+:
http://www.geautomation.com/products/quickpanel-view
I would say go GE...
- if you like and are proficient with GE HMI software
- if you have GE HMIs & PLCs everywhere
- if you want to have a single vendor solution on this machine
I would say go Proface...
- if you have QuickPanels everywhere with PLCs from multiple vendors
- if you like and are proficient with GP-Pro EX
- if you don't want to be locked in to a single vendor for HMI and PLC