I haven't signed up for the SVS courses yet, as I'm still dredging through the courses on Schoolism. But I've been in your position, @hoppershaun, and kudos for finding this site. It's what I was looking for before I knew I was actually looking for it... The 3-Point Perspective Podcast led me here as well.
Many of the online self-guided education course offerings by various companies (like Udemy, Skillshare, or LinkedinLearning) are very broad and general and aren't really curated beyond user ratings--there's some good but lots of bad. Other sites are centered around a particular facet of illustration or art (Schoolism, Gnomon, Ctrl+Paint, and CGMA are about game and concept art; SVSLearn clearly leans toward illustration and children's lit; New Master's Academy, Vilppu Academy, PencilKings, & Watt's Atelier obviously bend toward studio fine art) but there is course content one can lift out of the particular focus of the courses available on each and apply to anything you want.
That being said, it took me a while to actually figure out what it was that I sought. And even longer to assess my own success or failure in any of the particular fields the schools served. I went through exactly what you mentioned ("3D modeling!! I gotta learn ZBrush!! I gotta!! Why? Because everyone is learning it!! I dunno what I'll do with it but I guess I gotta learn it!!" Note--I never learned it.) I made the wrong choice with Schoolism, as I've learned concept/game art just isn't a field for my inclinations, but most of the basics that are taught in some of their classes are still relevant regardless.
But with SVSLearn you have a BUNCH of courses from a wider variety of teachers. For example, Proko--who was taught through a Fine Art lens--has figure construction classes available here. And other teachers with their own courses available on Gumroad (Marco Bucci, for example) also make some of their courses available here. So for the price of a monthly/yearly subscription you actually have a much wider variety of curated and relevant illustration courses available from instructors from a wider swath of the industry than you might have from other services, but not so wide that half the courses are irrelevant. It seems ALL the courses are relevant here, just by looking at their titles. The price can't be beat. Individually, the cost of those courses from each individual creator add up to FAR more than you pay here.
The one thing that Schoolism has that SVSLearn doesn't have (at least, I THINK it doesn't, as I haven't signed up yet) is recorded video response from the instructor to the uploaded homework of the previous students who have taken the course. The classes at Schoolism are taught "live" at specific times of the year for a much higher price than the norm, and the weekly feedback generated from each assignment is saved and put in a bank for self-guided subscription students taking the course to watch on their own. So you get the course itself plus 25 15-30 minute feedback vids of other students homework for each weekly lesson so you can see how it's critiqued.
Taking a course live is, consequently, somewhat expensive ($800-1500) as the instructors themselves have 15-25 students each week for 8-15 weeks, and you pay for their time. Think about it--20 students with 25 minutes of feedback each each week means almost a full 8-hour day of video recorded response, paint overs, and processing every week. Plus making the video itself. And answering all their email questions and such.
Schoolism also has a Facebook group specifically for uploading homework from the courses for the self-guided students. But this forum for SVSLearn seems far far more effectively applicable in a much broader sense for students and non-students alike for a wider variety of illustration disciplines. Schoolism seems very much "all-concept-art-all-the-time". To me, anyway.
Just an FYI. If I had my druthers, I'd have signed up for SVSLearn over Schoolism. But I didn't know enough about myself back then. And just because their course instructors are successful in that industry doesn't make them good teachers... hehe... I've taught higher education for 20 years. A LOT of the critique vids made my skin crawl and infuriated me... hehe... But I paid for a year and have to make the best of it.