After playing the game for decent amounts of time on both a hunter and a warlock, two very different ends of a spectrum, it's quite clear to see which base main stats out of recovery, resilience and mobility matter. Firstly, the phrasing of the description of mobility is pretty flawed and plainly wrong and indicates that it increases movement speed (quite a broad subject) but after seeing other people's testing it clearly doesn't change sprint speed; only normal walking speed and jump height. Resilience is also an ever so minor increase that it's barely even noticeable. Recovery, however, reduces the time it takes to recover health pretty substantially. This is definitely part of the reason why warlocks are so high in the meta right now but also just leads other classes to grind towards recovery specific armor sets (like the stuff from Engrams on Io for titans and hunters). Sure, this is 'endgame' content but wouldn't it be much more interesting if all the stats were on a level with recovery, perhaps even higher? This could add pretty interesting dynamics to play like hunters being able to zip around fast and be agile more so than other classes and titans actually be tanks and more beefy. The thing is, Bungie haven't released any statistics or statements on any of the main stats so we're pretty much left in the dark.. It would be useful to have some stats on the underlying properties of these stats and what they actually do rather than having to run tedious tests. It would be pretty interesting to see all these stas on a par level, where each class (in terms of these stats, at least) is balanced and different from the other classes in its own way one day, rather than having the boring system that we have now with recovery being by far the best stat and mobility being next to useless (probably another part of why hunters are considered very weak at the moment, they get the worst of the three stats). Hopefully, we can see change to these stats or at least get some real statistics on how this stuff actually works from Bungie.. It would definitely make a difference.