The Faital FE22 used in the Genzler has very wide dispersion from the low mids to 5khz and slightly narrower above that but consistent.
When vertically arrayed, you lose vertical dispersion depending on the length of the array. I assume this is why the slant version exists. Stacking three slant cabs would be a really low compromise solution as done in prosound line arrays. See Presonus CDL.
The F12 will have slightly narrower dispersion horizontally but will have overall wider dispersion vertically.
For a small single cab solution I would go for the fearless. For a modular stack Genzler makes a lot of sense.