R_J_K75
Legend
There was a lot of copy and pasting from 1EFR-3EFR.3E has only a little less than half the lore of 2E, and most of that is just copied over from 2E.
For me I prefer 2E Forgotten Realms because there was so much lore, so many locales were detailed besides the Sword Coast. At the end of the edition Steven Schend and Dale Donovan wrote some amazing books/boxed sets. Lands of Intrigue, Empires of the Shining Sea and Sea of Fallen Stars were great books. You could open to any page, blindly point at a paragraph and you had an adventure idea. Faiths and Avatars, Powers and Pantheons and Demihuman Deities were by far the best take on Gods of any D&D setting. Cloak & Dagger was the last book published for 2E FR and wrapped up the edition very well. 3E wrapped up that edition very good as well with The Grand History of the Realms.
4E advanced the time line about 100 years and introduced alot of world shattering events. I understand why they did it, to try and reinvigorate the setting but for me it fell kind of flat. For a setting that was so detailed to leave that 100 years blank seemed lazy and uninspired to me, and in 5E its still vague at best as to what took place and what happened to alot of the staple NPCs in that time frame. So if I'm running a Realms campaign I usually set it the 2E timeline.