Those two lights are mostly identical, price would be my first consideration picking between them.
I think there are still sets of the aluminum X6/X5 groupbuy. You could get two lights for a reduced cost that way.
Links for the different tints available:
1A
or
3B
Then go to this thread BLF Kronos X6/X5 GB - Group Buy now closed. and scroll down a ways on the OP to get the code.
Looking at the site the 1A tints are in stock but the 3B say usually ships in 10 - 15 days, whatever that might mean.