I have decided that a Which Is Better for ED in another Thread.
but to answer your question, Legend +100% ED is usually better than +5000 ED in PVE. in the DPS formula, the ED+ is added after ED%. if you are willing to do the math, you can find out if having ED% or ED+ is better for your Build.
for new players, ED+ is easier to put onto your Equipment, and you can get up to +35,000 ED (with a Pet). when you find items with ED% on them, depending on the Weapon used, you would only need 1 to 3 items with ED% to get just as much or more DMG than taking up 7 spaces for +35k DMG. don’t forget that if you don’t have any WD% or WD+, then your ED% & ED+ kind of act like WD% & WD+ instead, except they are used by both Weapons if they are the same Element.