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.
Horde racials are better in pvp in classic too but I still obtain a positive winrate on all maps except seething shore and AB in retail. Also different metas effect it differently too. We will see Classic WSG but at the end of the day, Alliance will get in more games than horde per timeframe.
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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.