The major differences between ARK and CE is this:
As you know in ARK you can build rooms of infinite sizes as long as a foundation and it’s overarching ceiling is connected by 2 opposing walls or pillars. E.g : Pillar-less rooms of any size, as long as it’s indoor.
In CE you have structural integrity to consider, meaning tiles loose structural support, the strength of which radiates out from pillars and walls connected to foundations… Eg. Pillarless rooms can only be 8 tiles from wall to wall, otherwise you have to place pillars at every 7th tile interval. (walls at every 8th tile interval)

Other then that, construction in ARK and CE is identical. Same wedges (triangles).
The strairs are much longer on ARK… in CE stairs are perfectly sized to occupy 1 square tile. So… if you have a 2 tile high room, you need 2 tiles to accomodate a 2 tile stair to go up to your “second floor” - practically 3 tiles, because you need access infront of those stairs but you know what I mean.
Ramps and stairs are the same dimensions in CE, and don’t poke through the floor like they do in ARK.
Ceilings are perfectly level with foundations, unlike in Vanilla ARK.
Walls have clearly marked “outward facing” ghost placement models. Mousewheel is used to orientate tiles, as oppossed to the awkward “Q” and “E” of ARK.
Pillars have a singular snap point, as oppossed to ARK’s multi-snap pointed Pillars…so you can’t do things in CE like this:
But since everything is uniformly 1 tile high in CE, you can do things like this:
After the latest CE updates, all chests and workshops are pick-up-able. This is built-in vanilla functionality.
Overall CE does feature a better construction set “out-of-the-box”.
The only thing ARK has over CE, is the “ladder” furniture orientation trick and the perspective camera for placing furniture.
in CE, trying to align furniture in a particular orientation is a hassle, especially on large structures because the camera can’t zoom out far enough to see the back of said structures.
The “snap-stackable storage boxes” feature of the S+ mod is perhaps the single most under-appreciated feature in the survival game genre, that no development studio has ever managed to implement out of the box.
Like, what else would you do with a bunch of chests?
Oh yeah - speaking of chests.
In ARK, you can place Canvas and signs over storage chests and you can dye chests.
In CE, you can only mount signs on structural tiles, not furniture, and you can’t dye chests, but you can pick them back up, with it’s inventory auto-transferring.
Most notable feature: Your character can have an “encumberance build” which means you can go infinitely over-weight without it affecting your run speed. You have 600 “slots” or stacks as your total cap.
With wood, stone and plant fiber stacking up to 1000, that’s quite substantial.
Better than Theri + Direbear all day…
Furthermore, all construction tiles are crafted on your person. You don’t have to split stacks with your Argy all day.
You can climb any surface with your character, even completely overweight, at no penalty to your stamina. This is a boon when you are building. Everything is your ladder. Climbing axes are so yesterday.
All doors auto-close, but you have to manually open them. (one feature I miss from about S+ mod…)
Half Tek Doors 
You have Dino gates. They make for pretty good parameter walls as usual.
Fence foundations in CE aren’t terrain height conforming and 45 degree angle snappy as they are in ARK, but foundations can clip into the terrain more leniently, than on ARK. basically: Use foundations like fence foundations. Fence foundations are meant to be used in conjunction with foundations. (fence foundations can be stacked ontop of eachother… think of CE fence foundations as stand-alone stackable walls that are particularly fence-friendly.