if you are talking about the rear brake lines... the bracket is nice because you dont have to mess with any bleeding the brakes or anything but also the extended lines are nice to have to know you have nothing to worry about i guess its more personal preferance
I've had both... first the extension then steel braided brake lines.
I'd just go with steel braided since with a few places you can choose your length. I went with man-a-fre (I think) because I wanted to improve pedal feel and was swapping my rotors and brakes at the same time.
The "better" way to go is replace with longer brake lines to accommodate your lift. Change all four corners with braided stainless steel lines would be "best". You'll notice a firmer brake pedal feel.
The "easiest" and cheapest way to go is to relocate the bracket location by dropping it lower. Overland warehouse used to make a bracket but they're no longer in business. You can easily make it with a piece of 1" x 1/8" steel. This is what it looks like.