Over course of my le/mil time (nearly 20 years) I’ve had better experiences with streamlight handheld lights than with surefires- better bulb life, usually more lumens per dollar, and less issues with contact surface oxidation.
On the weapon light side of things it’s been better experiences with surefire, with the exception of the tlr series of lights. The older style surefire weapon lights were rugged as hell, but suffered from the same issues as the handhelds as far as bulb life went.
Streamlight remote switches seemed to last longer, and I still had issues with contact surface oxidation/loss of current flow with the surefires but it seemed to be less frequent than with the handhelds.
The biggest issue of any of them, the bulb life, has been kind of negated by the wider use of leds, but streamlight always seems to have newer technology, more robust switches, and more lumens for less money.
In the grand scheme of things though I think it boils down to personal preference,
Currently my stuff is set up with a variety of surefires, streamlights, and insight units.