Delta Gun Hype/understanding

[CJVx]

Hello, I see many praises on Delta Gun sets.

For my own understanding, are all phosphor dot shadow mask CRT's Delta guns?

Also If i am correct, GE was the first to implement the three segmented rectangle phosphor vertical line CRT's, and Sony had a similar design in their Trinitron, but the vertical phosphors were not segmented. Both non-delta guns.

So that said, why does the general consensus lean towards preferring delta gun CRT's?