I personally own the Pro and I love it. For $100, there is not a better case available. The Luxe is $50 more, and you are not getting too many extras. The lighting on the outside is nice, so is a 2nd SSD Bracket, but those things certainly aren't worth an additional $50 to me.
The only legitimate reason for the Luxe over the Pro in my opinion is for top mounted radiator options. As it currently stands, you cannot do push/pull in the Pro with radiators. There is 65mm of space between the motherboard standoffs and the top. If you wanted to do push/pull, you would have to modify the top of the chassis. You do this by removing the top panel, and removing the fan filter. Thus exposing the mounting area. Only then could you do push/pull, but you would be without a top fan filter, unless you buy and add your own.
The Luxe has the same 65mm of space between the motherboard standoffs and top of the case, but the top section of the chassis has room for 25mm fans to be placed within the top compartment without removing the fan filter. Or, you could use a larger sized radiator, up to 60mm and then place fans underneath the top cover. It gives you more options.
Whether or not the Lighting, 2nd SSD Bracket, and extra top space is worth $50 is up to you. You cannot go wrong with either, because they are arguably the best case on the market considering their features, build quality, customer service* and price.
*My Pro arrived with a scratched inside window because the toolbox came loose during shipping. I sent in a ticket to Phanteks that very day, 10 hours later I had received an email, a telephone call, and a tracking number for the new window that was being shipped to me free of charge.