I'm not trying to sound like an audio expert but I'm gonna try to break it down...
First off, the Studio Beats is the only headphone I'm going to rate in the dre selection as it is the only headphone I've had experience with and have owned them for quite a while.
Price: 350 give or take depending on where you buy them
Pros: Unmatched BASS for the price your paying.
Great quality sound for Trance/ Rap/ Pop/ Techno (Bass/ Melodic music)
Cons: PLASTIC
Enhanced sound (meaning you are listening to a tuned up version of any song automatically not necessarily a con but for audiophiles this is not wanted)
Slightly uncomfortable as the headphones cup your ears
Batteries
I've recently purchased the Bowers and Wilkins P5s and here's its breakdown:
Price: 300 give or take
Pros: Real sound (You feel like you are in the studio with the artists or sitting front row at a concert)
Much better delivery of classical / jazz/ vocals (instrument based music)
THey feel expensive

Materials used is real calf skin leather, stainless steel, brushed aluminum
Microphone
Slimmer than the beats
Sexier headphones (beats are cooler these are sexier

)
No batteries (This should be standard but is a necessary mention since beats are batteried)
more comfortable and ergonomic on the head
CONS: Bass is decent not as good as the beats
uncomfortable around the neck
attracts too much attention
Basically it is a matter of your taste in music if you enjoy more upbeat music go for the BEATS as it delivers only in that department and is marketed that way if you wanna listen to a wider range of music go for the P5.
P.S any body who enjoys listening to music H*GH needs to listen to Apologize by one republic (the version without timbaland) with the Beats its pretty EPIC