A couple of notes here:
SBQ pure photopolymers can be post exposed. Dual Cures and Diazos don't benefit the same as SBQ from post exposure. The initial light strength and exposure determines a lot more of the durability than post exposure or hardening which are band aids to fix exposure. We never used hardener on most jobs using Aquasol TS, high res SBQ, since an 8K metal halide with true film maximizes the exposure. That is a pet peeve I have about LED. It's not how short you can expose for it's how well you expose the screen. Our tests show SBQ in the sub 10 second range, its the tenths of a second that can make the difference.
LED is applicable to many companies. However as noted it can have a hard exposure on print side and soft on squeegee side, so SBQ is better on LED for post exposure to harden the squeegee side. Halftones on MH have better cure and side wall formation, but LED is fast, easy and convenient and works for most shops. Once I hit huge volume though metal halide has stencil exposure advantages. Like many pieces of equipment available what works for one shop may not work for another.
Al