Smooth vs sharp edges in horns.

Thanks for everyone's replies to my last few posts about horns and compression drivers. I have another one. Looking at 2 horns with the same specs but very different looks. The Dayton H6512 and Eminence SST-1.
Dayton Audio - H6512 6-1/2" x 12" Waveguide 1" Threaded
https://www.eminence.com/speakers/hornflare-detail/?model=SST1

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The H6512 is very rounded while the SST-1 is "flat-sided". I am wondering how this affects the sound.

Secondly, if the flat side design works well would anyone have a design to build this by laser cutting thin pieces of wood so they could be assembled into a horn (like a 3D puzzle)?
 
Every edge creates a reflection (echo), so i like the top one better.

Diffraction horns can sound very "live" adding a pleasant addition to the music.

Ideally, so diffraction slot, no edges, no corners, round over all the way to the baffle, and not very deep.
 

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