The white colors reflect the light at night best however shows the most dirt, A Tub with a rough textured surface does not show scratches, smooth surfaces will show scratches, the darker colors wear well, your choice.
I have a sandy taupe colored Hot Tub.
Re LED Lighting: With dark color tubs it is better to use a 22 - 24 light LED which is much brighter and shows the colors better in dark color tubs. Many factory offerings have as little as 7 lights which work fine in a white or light colored tub.
I added the LED lighting from an after market source.
The cost of the aftermarket LED was 50% less than what the dealer offered. $99.00 usd
Installation is an easy plug and play exercise with most Tubs as long as it uses a 12 volt system without a dimmer.
While not essential I highly recommend this feature as it really adds ambience to the Hot tub at night. Really Cool.
Zz