I really don't suggest putting 'vs' in any title for anything, it makes it appear as if the games are fighting against eachother, and the simple phrase could cause battles between other users.
Anyway, on the topic, do you ever notice how theres a bunch of them, 'war games' and all, where you shoot the crap out of people?
If you would compare them with animal MMORPGs, which is just pretty much Feral Heart, Impressive Title, Impressive World, Impressive Title Reborn, Aro'kai (Which is yet to be realesed) and Aeon Phase. (I'm not too sure weither this is out or not~] Those would really outnumber the games listed above.
So what? The people may of had similiar ideas, and Impressive World is simply a re-creation of Impressive Title, the last thing it and ITR would be doing is fighting with Feral Heart~.
As for Aro'kai and Aeon Phases, if anything, IW, ITW, and FH would be doing anything with them but starting war. The comunities would be trying to get along with them, not 'cyber' fighting them.
As for Wolf Quest, the game isn't what I would call, social, and as far as I know, it stays in the shadows. In my opinion actually, the game is built better than Feral Heart, but not nearly as fun.