Looked up some of the details.
Essential Pro is a 70/3 thread -- meaning it is 70wt, 3-ply. I assume the 3-ply means that it is manufactured as a multi-filament polyester thread.
So Fine! comes in both 40wt and 50wt, both of which would be heavier than Essential Pro. It is a multi-filament polyester thread.
Bottom Line is 60/2 multi-filament polyester thread, which makes it finer than either of the So Fine! weights.
Glide is a 40wt trilobal polyester thread, which makes it heavier than all of the above. Although the Superior Threads trilobal polyester threads are not as strong as their multi-filament polyesters, my experience is that Glide is stronger than all of the Superior Threads listed above, whether multi-filament or trilobal.
Here is a Superior Threads article that describes its different types of polyester thread:
http://www.superiorthreads.com/polyester-thread/