I fully agree with the original poster (except Sharapova being completely immobile), I remember thinking the exact same thing a couple months back.
- She has a ton more variety in her shots (both flat, accurate or lots of spin)
- She moves quicker and moves better
- She has a more consistent serve
- Her net game is head and shoulders above Sharapova
About the only thing I can think of is that
Sharapova has a slightly more aggressive service return game, and
she has more power off both wings. Azarenka sometimes sets up the point whereas Sharapova uses power to muffle out any response. Sharapova
also shows a lot more determination and mental stability. So she tried hard to NOT LOSE when she's not doing well, whereas Azarenka will sulk. Sharapova gets more consistent and seemlingly hits harder lol.
It's that determination and a little more consistency in power that I think gives Sharapova more success at the moment. Plus she's been on tour longer.
I feel in the long run Azarenka will win more titles if she stays healthy.
The results show it too, Azarenka has had an overall more consistent stay at the top and performs just about the same in EVERY tournament. It explains their head to head, where I believe Azarenka beat Sharapova at least 4 times in a row over the stretch of 2012, some weren't even a contest. In 2012 she won 4 out of their 6 meetups with an overall head to head of 7-6 (source Wikipedia)
Today at French Open, Sharapova won. It's odd she says she feels she's a cow on ice, but she has had consistently far placings in FO since (past 5 FOs she's made it to QF or farther except in 2010)