I recall a formal study comparing the safety level of aircraft landing performance between those aircraft with thrust reverse and those without.
Much as expected those aircraft without reverse had less overall safety margin - not sure how that was defined.
I also recall a follow-on study considering the failure of reversers to deploy. Here the aircraft with reverse (failed) had the lesser safety margin. And with fast fading memory, the 737 did not fair particularly well (anyone have a reference for this report).
A conclusion was that the 737 thrust reversers contribute more to the landing performance than other aircraft, the 737 being less able to stop than other aircraft without reversers.
Ratio of effectiveness - reverse vs brakes anyone?
Size / capacity of brakes, brake materials, type of anti skid.
From an HF aspect perhaps those crews operating aircraft without reverse are more risk aware than those who can select reverse - but not necessarily safer. But if reverse fails …