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Pro Ed is the standard text editor
As the standard text editor, it's available on multiple systems.
Pro Ed has a consistent user interface and error reportage
Con Not a lot of features
While extremely fast and simple, it simply is not for programming for a long time because it lacks a lot of important features, it's instead for quick edits.
Con No persistent UI
You can only view portions of a file through search or regular expression commands. You cannot scan or scroll through a file using the available screen realestate.
It's not too dissimilar to only being about to use command-line tools such as grep and sed for editing a file. (in fact, both grep and sed are based on how interaction is performed with ed)