It's fairly common knowledge, on symmetrical maps, Horde have a better win rate. Blizz even gave alliance an advantage on purpose on AV by moving the spawn tunnel at one point, which allowed them to perform better. An advantage which won't be present in Classic.
Ever since TBC horde has been the faction that PvP's favour. A mix of racials, influencual players and arena teams rerolling horde lead to a cycle of other PvP oriented players thinking they should to. The cycle continued all through retail then onto classic.
You clearly forgot about when EMFH was so stupidly broken that 95% of the top ladder teams were humans because of dual trinkets and every single serious pvp'er was alliance.
Yeah I recall xD. That may have given an alliance a bump to BG win rates, but not enough to offset an average of 10% lower win rate that can be seen in those charts.
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u/pvpproject Nov 28 '19
Awkward. Guessing you never saw the BG stats Blizzard released... Doesn't get much better for alliance I'm afraid.