So... what exactly are the differences in content you mean? Do you mean the "some players edit Wiki1 and some edit Wiki2 and both wikis are in constant struggle to get more content" differences? Or do you actually have different target audiences? Currently I don't see anything about the latter...
Until now, I have added several pages to tremwiki with pretty detailed descriptions and hints, in an effort to get the more reading-inclined new players up to speed (it's a constant source of frustration if I see a newbie team making the same newbie mistakes that one billion newbie teams have made before). I think all such information (team descriptions, base descriptions, base hints, strategic hints) should be collected in one place rather than two - bad enough that so much basic information is already hidden in the many threads of this forum.
So, is it really necessary to split the powers? Couldn't you just merge the advantages of both wikis into one site? After all, this second wiki is just the signal for another group to come up with the third wiki (well why not?) and so now you could make clear that Trem people are not of the unorganized kind that can be found at so many other free software. The Manual has already done a great deal for this (at least I can't remember another free game with such a good manual), so I think it would be good keep further documentation in a newbie-friendly way as well.
Thanks,
Oliver