Seeing as the Draenei are the largest race on the Alliance, it's easy to relate the two in a simple sense. But, go past that, and the similiarities come to a standstill.
The DRAENEI
1.) Are blue.
2.) Are big.
3.) Are Russian.- I think they're Pakistani or Indian, really. Their voice sounds russian, but their dance is not. Strange.
4.) Are Religious.
5.) Prance.
The TAUREN
1.) Are furry.
2.) Are cuddly.
3.) Are big.
4.) Are Texan.
5.) Are Hippies.
6.) Graze.
As you can see, the Tauren have only one similiarity to the Draenei, and that is that they are...well, humongous in proportion to the other races.
Draenei males- have weird tentacles, a strange body build, and a laugh that makes me want to punch babies.
Tauren males- are warm and cuddly, with a heavy muscular build, a dance that is endlessly entertaining, and their laugh makes me happy.