I generally can't stand some of Surefire's business practices. (Too many to name). So yes, I did try to find a rival company that's just as good as Surefire; in terms of overall quality. Some came awfully close.... PentagonLights, Streamlight (certain models), Inova, etc.
Some could even compete with Surefire or did better, in one category or another. However, I must admit that in terms of overall quality; none could topple Surefire. The company also has no rival when it comes to clip-carried lights. Something that for some of us, especially me, is very important. (I have a Night-Ops Gladius that sits at home, for lack of a clip & a good holster to carry it in. Still, I'd probably grab my Surefire L5 most times).
I've had experience with clips that screw directly into the barrel. They seem strong, but are quite weak. Ironically, I've had better luck with wrap-around clips. Still, nothing beats the Surefire design for attaching a clip to a barrel. The only other company that comes close is PentagonLights. But Surefire's system is still better.
Some Surefire models could be replaced with equivalent lights from other companies..... Some cannot. You won't find the performance of an L4 in a similar sized or smaller package. You can find it. And it's going to be bigger, heavier, probably without a great pocket-carry clip. Show me a light from another company as good or versatile as a Kroma.
Most of Surefire's competitors don't support their lights with a good range of various holsters. (PentagonLights does a decent job of this. Wish I could say the same thing about Inova).
If Surefire was a person, she'd be a musical Diva.... Demanding, sometimes arrogent, sometimes hard to deal with.... But when it's showtime, when it's time for her to perform; you know it's going to be great. When it really matters, you'll be glad you bought a Surefire.
(And when the performance is less than great, like Surefire not recalling the U2 after it became clear a significant number of them failed to perform reliably out of the box; you get to give that diva a raised eye-brow. :ironic: .... And chances are, the problem will be fixed sooner, rather than later).
Overall quality = Surefire.
*But if anyone knows of a company that can beat it on that, please post!