Ok, I looked at the first two and didn't bother with the last two because you didn't feel it lived up to your expectations.
The First one..this one has a high density poloproprylene material (Sounds 'tuff), while the second well...doesn't have such material.
The First one has this:
- Many inside pockets
-Two large exterior pockets
-Back strap to attach to a trolley
-Hunan 433 is expandable
The Second has this:
;Multiple pockets for folders and other accessories
;Detachable padded shoulder strap
Comparing the two: The First has MANY Inside pockets...they didn't elaborate on many so it's safe to say that it may be to MANY that it'll get in your way. It has a 2 Large pockets which are good for storing things such as notebooks, CD cases, and whatnot. AND it has a backstrap so it can attach to a trolley..that's helpful if you feel like crumbling and want to attach it to your nearby trolley.
The Second has multiple pockets...again..Multiple...may be a lot..may be a little...who knows? but doesnt have BIG pockets on the outsides for folders and accesories for fast and easy access without having to fumble inside you bag. It has a detachable shoulder strap...for what?? The first one has a backstrap so you cna attach it to a trolley! Why bother removing a shoulder strap?...and removable dividers....wow...you gots folders...need dividers? Maybe. Maybe not. Your Choice but my vote goes to the first vanguard notebook case