Check world.guns.ru for an example, even the russians themselves say the mosin was an average rifle, for average citizens to use. Nothing special it just works, and that seems to be the prevailing idea from the originators on that rifle. Yah it worked, nothign special.
Then i could go on and on about the mauser action and its longevity, safety, reliability, accuracy and how it set a benchmark until this day from which it is still used and copied...a notion shared by many prominent gun makers, shooters and writters...
then the mosin lovers will jump all around and say their mosins are the greatest thing since sliced bread, arguing superior reliabilty, simpler action and better sights...
then the enfield lovers will jump in and say the enfield is better than both, with smoother actions, better sights and bigger clip capacity...
They all work, its personal opinon. The accuracy and reliability differences i would say between them are near negligible for even hard use. You would have to give a mauser, mosin or enfield a HECK OF A THRASHING for any one to malfunction. That being said i think for a good quality rifle for any of these optoins, the MOA difference would be 1-2inches at most, all will place within 3-4 inches with milsurp or better unless you have a beat rifle. The rest, ergonomics, action smoothness, mag capacity, sights etc are all up to the users preference.
Personally i think the 7.62nato mausers, israeli and spanish FR8 are the best overall for regular use. Near new barrels provide fantastic accuracy in a widely available .308 cartridge. Everything great about a reliable milsurp action in a common cartridge. Now if those .308 enfields were only cheaper and more available, in Canada id be interested in them too, but im a mauser guy myself.