Fenix makes better day to day non-tactical practical lights IMHO. The USB chargeable light is brilliant.
But when it comes to weapon mounted lights, surefire is better in the design - not so much in the mechanical or circuitry design, but “the idea” , the mounting interface, the dimensions and the ergonomics for using the lights. It is like how the first “iPod” was designed. It doesn’t have a million confusing buttons for functions that are not needed. You can see that their tactical products are developed with input from people who know how to use weapon lights.