Well, despite it being a poorly executed thread I'll add some meat to the gravy.
Well i will always tilt towards horde more, with races like orcs, tauren and trolls, there are still elements in the horde I will never like, such as anything forsaken based, or the split between the two kinds of orcs. I couldn't really care less about blood elves, and goblins are just for comedy so I never take them seriously.
Now alliance, since the main front story of the alliance are the white knight jock d-bags that I can't stand in any story genre makes it impossible to like them, and just how boring humans and night elves are, there are still aspects in the alliance i do like, such as the gilnean worgen, the draenei and even sometimes the dwarves (when they are not just appearing as stunted humans following the same code of practice).
Both sides have there pros and cons, but the cons I feel towards the alliance outweighs any interest I could have for them.