I always thought the lines of the A1 are iconic and aesthetically pleasing.
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Polymer and metal, an abstract composition.
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I was about to post:
You can't get them in the same gun if you want an AR platform as you are going to go large frame for the 243 and small frame for the Grendel.
Between the two I would go Grendel.
Beauty is personal....this is why some guys like fat chicks.
As far as black rifles go I always had a thing for xm177 or CAR-15 here there same same.
Building something like that has got my interest from time to time but never did it, and any loose nut can screw one together...it aint hard.
Doubt I ever will, don't want to go to the hassle of messing with all the stupid paperwork to make one "right".