Sorry - what exactly is your question about?
Is it about options to build a more modern UI using Progress Openedge?
Is it about the Development tool ( AppBuilder ) vs. Progress Developer Studio ( which is an Eclipse plug-in )?
Anyway OE10 is completely out-dated and not supported anymore. If you are stuck on OE10 you will only have very limited options regarding both compared to more recent version of OE like OE11.7 and OE12.