Rigid and cheap wanna-be lights aren't even remotely close in terms of output, and quality. Yes, they will both make light. That's where the similarity stops. Most all of the cheap straight bars coming from across the pond use tempered glass for a lens. Alibaba and eBay, it seems there are only a few people making them but a lot of 'resellers'.
Rigid and Baja use polycarbonate. ( lexan ) Toss both on a front bumper and drive down a gravel road to see which one lives, and which one is broken after following vehicles. Not to mention, once you break the lens, then the light is junk, unless you buy lexan in the same thickness and make your own lens. That is, assuming it arrived from China without the lens already broken.
Fit and finish is poor. A friend of mine that bought a cheap 30" one, has been trying to chase down a leak, even after taking it apart to seal it up with clear silicone. Bare wire coming out of the bar, no connector. The wire is adequate, but not great. Bare spots missing powdercoating in between the fins are hot spots for corrosion to start.
Cheap bars have basically zero invested in terms of reflector and optics. This is where the Baja and Rigid are light years ahead of copies. Warranty?
Keep buying cheap knock offs if it makes you happy but there is no comparison to the real deal.
https://www.youtube.com/watch?v=1vShTn7bWes
https://www.youtube.com/watch?v=EXMzkh-NzJk