Why not just create an official faq somewhere, taking count of each usual competition weights?
something like that, but with a "pro" (experienced) point of view :
classic (3.2g-3.3g) :
pro :
work out of box (especially miggle sets/figs range, buzzball figs range)
historic way of playing MF
no need to add weight or modify bases or figs
cons :
can be "bouncy" or inconsistant on some big boards
a lot of leagues preferes 4.0gram class
list of leagues playing under classic class : (...)
heavy : (4.0g)
pros :
more "room" for customizing
works better on some big boards
a lot of leagues plays 4.0grams class
cons :
heavy class athletes can be too strong against classic class athletes, causing incompatibility
need to watch out the weight during the team setup (customizing or training)
list of leagues playing under heavy class : (...)
etc, etc... you get the idea. Lets the beginners make their own point reading that official faq and watching 1) the material they have/plan to buy 2) the leagues and friends they can play with around, without any "that is better than this" argument, peacefully (Lennon, go out of this body now).
In my opinion (beginner oriented, of course), it should be usefull. Remember some examples we saw on that topic : the slot cars, the model railroad, the sport gun competition, etc, etc... other hobbies or sports with many diferent sides/scales/etc... in them always choosed that way, instead of saying THAT is the official something.
