I´m using PEP1 (PEP 2 only if no script for PEP1 is available).
Pronto I´m following for many years, but the design of PEP2 is unacceptable. I need several open pages because my programming is much visualized.
On my 24inch monitor the layout of PEP2 is not acceptable. Too small window for the active screen which I want to program. The difference is hard if you are used to work with PEP1. If you start with pronto system forget PEP1. Advantage of PEP2: the simulator is able to demonstrate scripts, not only pages/jumps like PEP1.
Hopefully PEP2 is becomming better main windows features like PEP1 soon.
PEP2 is faster in programming.
Until now no real need to change to PEP2.