Any anecdotal perceptions about one side being darker or lighter or one genre or another... are just anecdotal personal perceptions and should be taken with huge grains of salt. I don't think I've ever seen a map by musical genre, but from my years in the dust I've found an incredibly wide range of sounds all over the playa. Hell, sometimes it's an incredibly wide range of genres even within the one camp!
The 2:00 and 10:00 spikes (as I call them) are the outer edges of the city. That's where the LSSA (large scale sound art) installation camps are placed, as there aren't really any restrictions on the wattage. They are directed to be mindful of speaker placement (point 'em outward, not in towards the city and to neighbors). Coming away from those two spoke streets on each end of the city, there tends to be more of a restriction on sound.
Further back from Esplanade on the 2:00/10:00 spikes, things will tend to quiet down...or not. In the last few years that's turned out to be where a lot of large mutant vehicle support camps live... Heart Deco/Heart Phoenix, Robot Heart, Charlie The Unicorn, Purgatory Cruiser, the Purple Palace (which I don't believe comes out anymore). Don't expect things to be too quiet, though. Sure, the sound systems further back aren't in the 60Kwatt+ range you find closer in, but are still packing quite a punch. There can be some real gems to discover as you head further back.
Probably the biggest and most notable exception to the large scale sound rule is Distrikt (9:00 & G this year). They do bring a very big sound system, but they're also a daytime party - they typically start running around noonish, and then shut down at sunset. In 2011 my camp was at about 8:55 and G, just two doors down from 9:00 with Distrikt across the street, and we had a great time. Their speakers weren't pointed in our direction, and while we could hear the thump of the bass in the background, nobody in our camp had any trouble sleeping or carrying on a normal conversation. We were part of a pretty great neighborhood, and really enjoyed what seemed like an endless daytime parade of art cars ferrying passengers to and from the biggest daytime bar on Earth. Distrikt (and the Deep End as they were known before that) has been doing it for a long long time, and they seem to have got it down.
I'm also seeing )'(ooligan Alley reporting placement at 2:00 & B. If I remember correctly, they bring a full-on Funktion One sound system all the way from London. I'm not sure what they've got up their sleeve for 2014, but last year they had a big crashed plane setup that looked pretty cool.
Nexus (historically at 10:00 & G and heavy on breaks/dubstep/bass music) is taking 2014 off (part of me is bummed they won't be on the playa, another part of me is glad they're getting a well-deserved break). Hookahdome (historically at 2:00 and near Esplanade and heavy on world music) is also reportedly taking 2014 off (and will also be missed).
Anyone who's interested in the large scale sound camps would be well served to explore both sides of the dial. You'll find completely amazing stuff, and meet completely amazing people on both sides of the city. You'll also pass by camps whose music you don't connect with, but that's no problem. Keep on walking or pedaling, and that will soon change. You should also plan for plenty of deep playa exploration, too. Some of the city's best sound systems are actually fully mobile. They bring the sound to anything from big art installations to random locations out in deep playa and make the magic happen damned near anywhere.
As far as east/west, the BRC city map shows that once again North is approximately where 10:30 would be on the dial. Technically I suppose that would make the 10:00 side west and 2:00 side east... but it could also sort of be a north/south side.