I spent all last season (140+days) skiing on a pair of top end bindings (Tyrolia FF17) and a pair of supposedly inferior 2-piece consumer bindings (Tyrolia Mojo11).
Both sets of skis used in equally demanding situations and terrain.
Whilst the FF17 had nice bells and whistles (diagonal release, more elasticity etc.), I can safely say that I am perfectly happy on both bindings, and will be perfectly happy to ski both for an additional season.
Clearly if I were going into a rutted course, I'd choose the one with the higher elasticity.
However, both bindings released when I expected them to, and retained when I expected them to. No surprises.
The whole point about DIN (Deutsches Institut für Normung) is that it isn't vague - it's an exacting (worldwide) standard, so that no matter what brand of binding you buy - a DIN 5 is a DIN 5 across the board.
The appropriate DIN standard that we are discussing is:
DIN 7881-5 - Winter sports equipment; release bindings for alpine downhill skiing; adjustment scale for release values (also ISO 8061:2004)
A Type 1 Skier, weighing 76kg, 5'8" in height, with a boot sole length of 305mm will have a DIN release figure for his toe and heel piece of 5.5. This will equate to a nominal release force of 50Nm at the toe (twist) and 194Nm at the heel (forward lean).
On a binding release testing machine, we will test for a nominal of those release figures above, with a manufacturers testing tolerance being accounted for.
When they are both brand new, an Atomic release at 9 will be identical to a Salomon release at 9.
Over time, with dirt, worn springs, dirty grease, worn parts etc. no doubt this will change relative to each other.
There is something else to take into consideration: The individual features of each binding manufacturer.
The torque figures in Nm are given for a twist in the horizontal plane for the toe piece, and a forward lean "up" release for the heel piece.
Different manufacturers have different features, eg; Tyrolia and the diagonal heel release, Salomon and the spheric release, Marker and the upward toe release - so there will be some differences in release strategies, but on the whole, for the two "standard" figures (twist/toe. forward lean/heel) - this will always match the DIN for ANY binding for ANY manufacturer.
Other factors to take into consideration are skier, technique, terrain, shock loading, stiffness of skis etc., all of which will have an influence on if/when you release.
Elasticity was talked about briefly above. Yes, there is a difference between say the top end model, and a base model.
Salomon S912Ti has an allowable toe elasticity of 48mm lateral, 10mm vertical.
Salomon S710Ti has an allowable toe elasticity of 32mm lateral, 15mm vertical.
All that said - if you're centred and balanced well on your skis, you won't have to worry.