LT Flex on machine wiring.....

[GoldDigger]

It is a bit cheaper and many inspectors don't check to see if you are using the listed product.
I asked a manufacturer's rep why they still made the non-listed product, and his answer was that it is not a violation to make and sell the product...just a violation to install it.

Which seems to be why there are also so many unlisted "plug and pray" PV Grid Tied Inverters on the market.
But there there is at least a chance that CPSC might assert jurisdiction and crack down on them someday.