Performance comparison... That depend on the eye and if you can mod. Stock, everybody would probably choose the brand light. But if you can mod, well, then it might depend. And if you are cheap, then its interesting to see how small differences there are between some expensive and cheap lights.
NEW 612, have crap UI stock. I think its funny to see basically the NEW 612 with a side switch, some slightly better parts and probably better anodizing too. And about 10x more expensive with the Spark name. :p
T10 host, have excellent quality. Probably at the same level as the Lumintop, but its not a brand light. And its a slightly different body due to sideswitch. Its mostly sold as a host too, and in different color.
Terminator vs Nage. Now sure how stock compares with stock. But I would question if its worth the differences. As a mod host, I think the choice is easy.
Small Sun vs Eagletac. Stock, the small Sun is nothing to brag about as it is stock IMO, but its super cheap for what it is. (ZY-T11 comes with plastic reflector, ZY-T29 does not). The Small Sun can be upgraded with a very sophisicated DrJones driver, which in several ways exceeds the driver in the Eagletac, you can upgrade it with AR coated lens, copper MCPCB, XM-L2, etc.. You can even push out 3,8A+ to the emitter if you want to go crazy. J) Finish and such will not be on the same level, but in several ways, it can kick the Eagletacs ass if the potential is unleashed, and at a much lower price.
Small Sun and Eagletac are obviously not the same type of light. But the others ones, gotta wonder if some come from the same factory or if they are just very good clones, sometimes with a little twist.