HREW & DOM
I just have to sound in here...
There is no debate which is stonger, DOM or HREW. However, for my application HREW is perfectly adequate. If memory serves, HREW has a yield of around 45,000 psi whereas DOM has a yield of 70,000 psi. 45,000 psi is nothing to turn your nose up to. SCORE specs are typically for vehicles that are travelling in the 100+ mph range. The last two times I rolled (with HREW cages) I was going less than 10 mph. Both cages held up fine, but because of the nature of what they are designed to do, I scrapped 'em and built new ones just to be cautious.
If DOM were anywhere close to the same price as HREW, this would be a non-issue. But, here in Colorado, HREW is $2/ft and DOM is $6-7/ft for 1.75 x .120 wall. Sorry, but that makes one hell of a difference in price when you're buying typically four 20' sticks per cage. We're talking the difference between $160 and $560.
I'm damned proud of my HREW cage... and the Hanson front bumper I applied the $400 I saved by going with HREW.
DOM is stronger, but at 45,000 psi yield combined with my own rolling experiences (I really need to back off that skinny pedal), I have found HREW to be plenty strong enough.
FWIW
Miley