I have neither set, so take this for what it's worth.

The Darlington lines look exactly like those from Goodridge and StopTech that I have used in the past. Well built units with solid connections. BUT, they do not list DOT approval on their packaging (that I could see in the ad), this could be very important if you live in an inspection state (especially with the clear sleeving, the lines attract attention). The DOT test is very strenuous, and it's important that the lines you use have approval (if not, I'd go down to Jeg's and just buy $30 worth of Russel components and make my own).

The Independent4X4 lines look very well built (look at the metal crimpings) and boast DOT approval. The red is a bit flashy for inspectors and may attract unwanted attention, but at least you have the packaging to back it up. Not many state safety inspectors will challenge the packaging of a product for DOT approval (or CARB approval for that matter), but it's important to have it with you.

Now, if you live in a non inspection state, pick whatever works, but I'd go with the ones that have been tested to the Federal standard.

-M