I've heard good things about both brands but theres a huge difference in price from Steeda's adjustable rear sway bar @ $129.99 to Maximum Motorsports @ $349.99. Is there that much of a difference between them??
Maximum's is much better, and allows you to toss the stock sway bar. I have an adjustable rear sway bar like the Steeda on my car, and it's nice. I had to modify my axle girdle when I put it on, though... But Steeda does make one specifically for clearing an axle girdle.