There's a BIG difference between brands. Granted we'd love everybody to run our stuff, but at the very least stick to brands that engineer, TEST and manufacture everything here in the U.S.A. There are several companies out there with parts that look similar to the good stuff in pictures online, but are manufactured in China using inferior material and with zero product testing.
You should also stick with a company that has a muscle car background and thoroughly track tests everything it makes. A part deceoped for a specific muscle car application to solve a problem with improved geometry, rigidity and adjustability will always work better than a part adapted from another application.
Also, beyond the "bling factor" mentioned in the post above, other reasons to use tubular lower control arms include
(in our case) delrin bushings that minimize deflection, adjustable ride height thanks to stackable spring cup inserts to fine tune the perfect stance, and the ability to use coil-overs if you want (however we've had fantastic results with sport springs and performance shocks).
Whether you use our stuff or not, do your homework and buy the most effective and reliable domestic parts you can.