oqueque keeps stats, and almost all of them are within 55-45% range. I think Strands of the Ancients is the only one that is really crazy favored for Alliance. Most of them are slightly favored to horde though.
Temple was strange for me. I lost 4 times in a row and didn´t even get close to winning, then on the 5th try, we crushed them (different pugs) and I even got a bunch of achievements. The Mine I won the first game and it took me half of it just to figure out how it worked.
But the biggest advice I can give you is that both of these are NOT AV... your individual contribution will matter.