Ok, lets compare the Wild Golden and Wild Jade Hatchling first, since they have the same abilities but slightly different stats: Golden has slightly more speed (273 vs. 244), the Jade more HP (1627 vs. 1400). I'd go for the Jade here: Speed is binary. Either you are faster than your enemy or slower (ok, they can be equal...) - but if you are slower it doesn't matter how much. And 273 is rather slow. Furthermore you can chose an Tail Sweep, which deals more damage than Breath if you are slower and double dips on the Lightning Storm's bonus damage since it hits twice.
Comparing Crimson vs. Jade: Really depends on what you want to do. In PvP there can be nice applications for Lightning Storms if you combine it with mechanical and/or often hitting attacks. In PvE (when going against tamers) however the Crimson Hatchling can be increadibly strong in some cases: E.g. the tamer in the Dread Wastes can lose his first two pets against a well played (and not too unlucky) Wild Crimson Hatchling. Right now I'm using it against the tamers in Howling Fjord, Dread Wastes, Kun'lai and the Spirit Tamer in Jade Forest.
As for the Emerald Protodrake: I couldn't try this out yet, but it might actually be even stronger vs. the mentioned tamers (or some of them) since it can't only heal itself but also reduce all damage taken - this might actually make it impossible to kill for even more pets.