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I chose a dark color because I will use it most often at night. When I turn on the LEDs I didn't want the whole tub lit up like Vegas. I just want ambiant lighting. Plus I figured if a scum line forms it will be less noticible with a dark color.
Only 2 major shell suppliers on the market so you're not going to see much variation. Just a heads-up...
It's nice you all get to choose like this. Only way I got my hot tub was agreeing to the color my wife liked. That happened to be Tuscan Sun which reminds me of a hot tub out of the 70's! But it has grown on me!