I have used all 3 of these products and PL/SQL Developer is the simplest and cleanest of the bunch to use. I can see where the UI could use a bit of freshening (themes, macro improvements, etc.) as mentioned in other threads but even so, I need it to stay consistent with its heritage. I can also see some merit to making its suite of capabilities a (paid) add-in to VS Code.

Gloss is worthless, and wizards only help hobbits.

My 2 cents worth...