Horde quests and Alliance quests come from two very different places, but I don't think one side is necessarily meatier than the other, and I say that as someone who spent the first three years of WoW playing nothing but Alliance characters, and the last four years transitioning to where now 99% of my characters are Horde. So, I really have seen both sides of the equation. And no, Orgrimmar never gets less confusing to navigate. ;)
Really, most people just have a preference about which side they like - there are always going to be "Alliance sux" and "Horde sux" people, no matter what the quests are like. In vanilla WoW, most of the quests were pretty balanced, but I can think of one epic questline that wasn't - getting attuned for Onyxia. Back in the day, you couldn't fight Onyxia without completing a long chain of quests. On the Alliance side, this chain ended with you confronting Onyxia in her human form, and having her morph into dragon form, having all the guards in the room transform into dragons too because that's what they secretly were, and then fighting her down until she got angry and flew away. The catch? All of this took place in Stormwind's throne room, because that's where she was hiding. Not only was the Horde questline *more difficult* but they didn't get the epic ending because it took place in an Alliance city (and there was no such thing as phasing back then). Claims that the Horde quests are now meatier generally come from the Horde quests being brought up to the level of Alliance quests.
These days, most epic questlines are even. The Wrathgate, for example, was pretty similar on both sides - the quests were a little different, but both factions walked away feeling like they'd gone through something awesome.
Basically, QQers are always gonna QQ, and don't feel like you need to make a character on the Horde side if you don't want to play one. If you do want to make one, I'd recommend the Tauren, since they're the least evil of the Horde races, and don't have many of the "beat the peons with a club to get them back to work" quests that the other races have. But eventually, you're going to run into the Forsaken, and it might not be good.
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Really, most people just have a preference about which side they like - there are always going to be "Alliance sux" and "Horde sux" people, no matter what the quests are like. In vanilla WoW, most of the quests were pretty balanced, but I can think of one epic questline that wasn't - getting attuned for Onyxia. Back in the day, you couldn't fight Onyxia without completing a long chain of quests. On the Alliance side, this chain ended with you confronting Onyxia in her human form, and having her morph into dragon form, having all the guards in the room transform into dragons too because that's what they secretly were, and then fighting her down until she got angry and flew away. The catch? All of this took place in Stormwind's throne room, because that's where she was hiding. Not only was the Horde questline *more difficult* but they didn't get the epic ending because it took place in an Alliance city (and there was no such thing as phasing back then). Claims that the Horde quests are now meatier generally come from the Horde quests being brought up to the level of Alliance quests.
These days, most epic questlines are even. The Wrathgate, for example, was pretty similar on both sides - the quests were a little different, but both factions walked away feeling like they'd gone through something awesome.
Basically, QQers are always gonna QQ, and don't feel like you need to make a character on the Horde side if you don't want to play one. If you do want to make one, I'd recommend the Tauren, since they're the least evil of the Horde races, and don't have many of the "beat the peons with a club to get them back to work" quests that the other races have. But eventually, you're going to run into the Forsaken, and it might not be good.