The Eagletotem Tribe is tauren only. I’d say the best way to experience tauren culture is to roll one yourself Kimmo.
But if you’re looking for more of a mixed culture for everyone, then I’d say The Hearthstone Tribe is your best bet. Their slogan is “A home for everyone”.
You can also check out other MG Horde guilds here:
https://us.forums.blizzard.com/en/wow/t/comprehensive-guide-to-moon-guard-horde-guilds/106070