Here is my take on SCS vs. TheCubicle.
Overall Vibes
The Cubicle gives off more of an original and robust feel. Its the same kind of feel when you eat comfort food. Everything there just feels a little more "comfortable." The customer service is friendly (I've had many-a-conversation with Jules) and their site is a little more playful in almost every way.
SCS gives off a much much more industrial or proper vibe. Their webstore and actual store seems really well put together and everything seems insanely perfectionist. I have to admit, SCS's customer service may be a teensy tiny bit more direct, but they get to the point faster, which is imo better customer service.
Winner: TheCubicle
Premium Cubes
-Lube services
The SCS 5$ dollar service and the Cubicle Pro Shop Lube Service is literally the exact same thing. Down to cost and quality. I personally think that SCS has a better simple lube service, considering that when it comes to big cubes, this service is like no other. CPS Lube Service adds a touch of smoothness and controllability to your puzzle, and I like that they're premade so processing time is the same as a normal cube
-Premium Services
-TheCubicle
I don't love The Cubicle premium service. Yes, their puzzles are absolutely through the roof, as my 4x4 and 5x5 main are Mystic and Angstrom respectively. My problem is that there isn't any sort of feeling of customization to it, which is 100% not the point of Cubicle Premium. But when you're looking for just a good puzzle overall thats that way right out of the box, get CP.
Side Note:
Cubicle Custom: If a custom WCA cube is what you want, then that's what you get. Getting the choice of a lubricant combo, (including core lubes) Elasticity for cubes that have them, and stickers of you want them sound like a pretty good deal to me! Getting a Cubicle Custom Puzzle leaves a feeling that you created this cube from the bottom up, and a professional speedcuber will set it up for you. It's truly a surreal experience. My problem that I have with Cubicle Custom, is a lack of magnet choice. Most cubes don't come in a a non magnetic variant, but they could at LEAST offer it for the YLM, The Valk 3, or the RS3. Yeah sure it will hike up the price, but there are a lot of people who don't care. I would kill for the ability to order a Valk M with lite magnets, without having to shoot TheCubicle an email.
-SCS
Supernova cubes are what you should get if you need a lubed puzzle, but you don't want to pay a whole bunch. They are a little cheaper than Cubicle Premium cubes and they are imop better quality. Yes you don't get as much choice, but it's still good nonetheless. Also, You still don't get the choice for setup, but being able to get a stickered Nova cube makes up for that fact.
Cosmic Cubes are Supernova Cubes taken up to 11. SCS takes the time to find the perfect lube combo for your cube and lubes it accordingly. Cosmic truly dives into each and every cube order to make sure their clients are not dissapointed. You don't have the choice of lubricant, but imo Cosmic will
almost surpass any Cubicle Premium or Custom Cube! Plus i think the Cosmic Logo looks better lmao, but not better than the Cubicle Labs logo. Nothing Surpasses the Cubicle Labs logo.(Also, when I purchase premium cubes, Cosmic is usually my personal go-to)
Side Note:
UniCube
From the extremely limited information I know about it, its SCS's version of Cubicle Custom, but its soooooo much better. You get the choice of Piece Lube, Track Lube, which i think is insane how you get to choose where the lube goes. Tensions,
Magnets 
, and stickers!
Winner: SCS by far
EDIT: SCS changed the cosmic logo and now it sucks
