I have players on both sides and I don't notice a big difference other than how characters look. Both factions and areas have their benefits as well as problems;

Trade chat in Cities. Winner? You've seen trade chat. Do you really think there's a winner??!!

Durotar vs Elwynn Forest. Winner: Elwynn Forest Durotar is gawd awful ugly and boring. Even the map overview is ugly and boring.

Ghostlands vs Elwynn Forest/Westfall. Winner: Ghostlands by far Why? Updated loot

Elwynn Forest vs Mulgore. Winner: Elwynn Forest. Mulgore has too much running to be really enjoyable. Every time I get a quest I think "I have to run way the hell over there?" The landscape is beautiful tho.

Barrens vs Ashenvale. Winner? Tie. More gawddamn running! Both Xroads and Astranaar should have mounts to rent to lowbies while they're questing. Little ponies or something. Astranaar is beautiful with its whimsical motif, but honestly, it's a pretty lonely place. Barrens? I'd like to see Africa IRL, but not in a game. It's almost as boring as Shimmering Flats.

Graveyard run to Darkshire in Duskwood, vs x-roads run to up north to where the harpies are. Winner? Tie!! /pant....puff....too...tired...from running....to decide. /pass out (the rental mounts idea doesn't sound too bad when you think about all that damn running, huh?)

Silverpine Forest vs Wetlands. Winner? Silverpine. Smaller, which makes quests go by quickly.

Meh, now that I think about it, neither side bothers me much.