I have the Mozart on Orange. Hardware wise, it is by far the best looking handset i have ever seen in my life, the unibody is crafted so well it's just amazing.
but the actuall device isnt that special. i would go for the LG optimus 7 that has a better battery life (1500 mAh vs mozarts 1200 or so) and really 8GB of storage is nothing.
so in that sense the LG offers better battery life and storage, also it has a "nand" memory, so it is generaly faster than HTC devices.
if you have any questions about the Mozart, i'll be happy to answer you.
wpGuy