In short i think you should decide first what your game is like if it’s a gameplay focused like mario then you focus on level proto in terms of gameplay,
if something like Witcher, rpg, adventure, some fps(multiplayer tho go into first category) then you focus on art side, like from concepts goes everything,
layouts architecture colors etc.
In first case you can afford to build levels right into ue without even planning if you have your gameplay etc (game like portal is a good example), though
if you try to recreate realistic landscapes right in editor without lots of planning concepts etc youll most certainly will create some blocky not so pleasing
locations just because of nature of process and tools used.
Eather way i think its better to use cct to plan everything because of speed and flexibility it provides, you can iterate much faster, even model details on the
fly and see the big picture.
Again maybe it’s hard for me to describe what i mean - one way is to work directly in editor planning and playing around, other is work from art/concepts up,
adapting everything to art source. Can’t say one is better than other cuz apples and oranges but that’s what i think.
Personally i prefer to plan everything in 3dsmax just because i can model at lightspeed there and don’t have any limitations, and you can directly transition
into actual modelling of assets in the same space. Sry for my english.