Can you elucidate your favorites?
I'm just scratching the surface, but here are some things:
The Clarity tool in LR kicks the crap out of the Definition tool in Aperture. Hard to explain, it just looks so much better.
The brushes in general in LR offer far superior control than those in Ap, particularly when it comes to things like exposure, white balance, etc. You could use brushes to do all that in Ap, but it was a lot harder than it is in LR. I really like the post adjustment capability of a specific brush set after you have done it. I need to learn it more though.
The lens correction toolset is fantastic. I particularly like being able to control how much correction happens with sliders for distortion and vignetting.
Somehow I am getting much nicer dynamic range when playing with shadows and highlights in LR. The same image in Ap with what I consider to be the most acceptable amount of Shadow/Highlight adjustments still has nearly black areas while in LR I can make it look great and realistic and bring out the detail without using a brush.
Import/Export functions are vastly superior in LR. Just so much more control and easy presets coming in and out. Easy to add metadata on the import like default copyright info, keywords, etc.
One area where I am not enjoying LR is the clone/repair brush. It works totally different than it does in Aperture or even Photoshop. I need to go watch a video or two on it now, because I'm losing my shiz trying to clone out a hot tub cover frame from a house I just shot.
Right now I'm processing two projects in LR and I also have them both in Aperture. It's nice to kind of play with them in both and see how they come out side by side. With the exception of the damn clone tool, I am far more satisfied with my results in Lightroom.