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I have a HS Envoy with the white shell. My neighbor has a Caldera spa with a grey shell. Both spas at night have cool lighting effects, but with the white shell the colors are much more vibrant. My neighbor has commented that they wish they had gone with the white after seeing mine.
Sometimes though, I like to turn everything off and just stare up at the stars. One night I saw two shooting stars within 5 minutes apart! Way cooler than any spa lighting effect The Aria is an amazing spa you will love! I love the grey exterior with a grey cover but my opinion, going with the white shell is the only way to go with lighting effects in mind.