The C8 looks way better without the spoiler. It also looks better if you get the spoiler and side blade in body color. I prefer the C7 design, but the C8 is looking better to me as I see more on the street. Maybe the Z06 will have some design updates.
A flat plane V8 is essentially 2 four cylinders in a V so it will sound like a very angry 4 cylinder. Some of the cross plane V8 with a hot V also do not have the typical V8 throb as each of the twin turbos are not fed exclusively by one bank. This effectively mitigates the uneven firing per bank by optimizes gas scavenging. The big advantage of the flat plane is a much simpler and lighter crank which can be spun much faster than a cross plane. It still astounds me the S65 V8 in the E90 M3 a cross plane v8 could rev to 8400 rpm. The flat plane V8 in the NA ferraris could rev to 9000.