Probably a lot of the confusion about these things has as much to do with technical ability (how hard stuff is to play) as conceptual...
For soloing, I learned in this order:
1 - box 1 (top 4 strings only, I wasn't taught the lower 2 strings because who needs those for soloing?)
2 - box 2 (the "extension" only, the top 3 strings)
And, to be honest, from there I'm not sure how I picked stuff up because it was a hodge podge of stuff from a lot of different sources.
If you are brand new to soloing, stuff like the 4 note solo is a good place to start because it's easy from a conceptual point of view. However, if you're new to soloing, trying to play my "4 note solo" as it is on YouTube, for example, would be a challenge because of the technical ability required to play the triplets, slurs, etc.
Understanding some history might also help:
1 - BGU came first and was the only course available.
2 - I noticed a lot of people got BGU that weren't ready... hence BBG came to be. That covers all of the conceptual and technical basics required to get through BGU.
Now, do you need more than BGU? No, absolutely not. A large number of people only have that and play very well from it.
However, some folks really like the 4 note solo and noticed that it's not part of BGU - so SWS was born because it is a cool alternate way to look at soloing and many people really gravitated towards that.
I believe the next problem was technique - so PSTM was born, followed by theory for obvious reason.
After that, I felt like a lot of people were learning the first 2 solos out of BGU, but the technical leap to get through solos 3-6 is pretty big after 1 and 2... so 5 Easy Blues Solos came on board.
And I could go on, but you probably get the idea. Every course fills a need that I noticed.
Conceptually, you can do this stuff in any order you choose... technically, you have to judge for yourself where you are at and where you struggle.
The solos in the Easy Blues Solos (5EBS and 5moreEBS) are the easiest, aside from solos 1 and 2 out of BGU. Some stuff in SWS is pretty easy, some is more challenging.
But again, you should use the mental model (boxes, 4 note pattern, house pattern) that works best for you, first. Then add in the others later. I believe it's worth striving to see the fretboard from any and all of those points of view.