That's an interesting issue, because snare positioning has always been my biggest problem (as for many other drummers I guess) in the global drumset setup (not to speak about distance between throne and snare / kit...)!
As we all perfectly know, also in the drumming world there are trends (gear, sound, and setups). Does anybody remember how high cymbals were positioned during the eighties? or how tilted were toms? And currently almost everybody plays relatively "flat" kits with relatively low cymbals. Obviously there are very good reasons behind this type of setup, but I believe that it is also a "fashionable" trend which will soon or later be replaced by another one (by the way: I cannot believe that the setups used by some players - with the rack tom totally flat and almost on the left of the snare - are comfortable to play!).
Concerning the snare positioning, I admit that I did follow a couple of dominating trends: almost flat during the late seventies (yes, I am quite old ...), higher towards the rack toms during the eighties, once again quite flat during the nineties (when I almost quit playing) and slightly tilted right now (I mean: similar to the setup used by most jazz players in the past and also more recently). In fact, I never felt really comfortable with the chosen positioning, and I am still struggling to find the best one. Actually, I now know that there will never be a "best one", and that I will continue to search for it ... Getting older also has some (minor) advantage ...