It's really all about production. Those places that have notable and consistent producers putting out compelling stuff, I listen. I couldn't give a fuck about MCs. Baltimore had a formidable sound, don't know where it went. It's a shame DJ Screw died as the South doesn't seem to have any guiding lights behind the boards. Grime is still out there, and it's still good where it's not indebted to American top 40 wank. Not really interested in R&B because 99.9% of the time it sounds like somebody vomited chrome all over it. The less gloss the better, far as I'm concerned. So really all the most notable rap releases are either uninteresting to me because of tinny, faceless 808 production or over-the-top Diddy plastic bullshit ("Falsetto" is actually kind of good, but the rest of the Dream tracks that I've heard have been turds coated in glitter).
If Flying Lotus is the touchstone for rap production in 2010, it's going to be a notably shitty year. Dilla aside, the Stones Throw roster is pretty boring. Actually Flying Lotus is too busy for an MC to spit over - If we were to put money down I'd bet on Dam Funk being the trendsetter for '10, and as we know from over 10 years of lame G-funk, blatantly nostalgic 80's synth funk is incredibly easy to fuck up. So look forward to that. Funk.
As far as "backpacker" vs. top 40 rap, I tend towards liking backpacker shit more because, uh, the production is often more consistent. With top 40 stuff getting "big names" is a thing, and as a result a lot of the shit that comes out of it is pedestrian. In my experience the best albums come from partnerships - A lot of people seem to want to suck the Clipse's cock because of the intensity of their coke-rap shtick or whatever, but I think the best thing about the Clipse is that they bring out the best in the Neptunes and vice versa. And the Neptunes are probably better than anybody else at taking a paycheck and putting out a really remarkable sound. Timbaland's also good.
On that note, how about that MIA? I could take or leave Diplo's solo shit, but the sounds on the MIA records are so good.