There are a ton actually (list from the top of my head):
-Building to Prop functionality
-Collision set to Everything will collide actors to things and allow you to place props faster
-Drops set to on will drop the actor on the floor after placing, perfect for clutter, and even better when used with Collision set to everything
-Instance cost of the prop you are placing (if it works, currently it doesn’t)
-Constant view of the in game memory bar
-Walk/Run and place rather than place then move in axis movement
-Brush multiselect (instead of having to click one by one in UEFN or rectangle select which selects the BG and disables the functionality all together)
-Saving selections in 9 slots (instead of a single slot in copy paste, in UEFN)
-Preview before placing, also with multiselections (UEFN just places it)
-Strict FN grid placement (by multiselecting a player structure with your multiselection, the grid changes to strict mode)
-Loose FN grid placement (the regular way you place architecture in a grid, using the phone and grid 2)
-Affirmation controls (SFX when moving things, UEFN is silent and not very polished)
-Faster selection and movement (gizmo in UEFN is hard to select)
-Faster workflow (UEFN would autosave and freeze, Live edit never freezes)
-You can test collision instantly
-You can test player scaling instantly
-You can test jumping/mantling/hurdling/door bashing controls and height instantly
-Pull/push controls when selecting an actor (fast to grab one from faraway and place near you with “Pull to Player” set to On)