Why do you use Windows Phone? (Updated)

What are some things about Windows Phone that you really like? I have a Galaxy Exhibit 4G right now but have considered getting a Lumia 521 (or a LG L9) as my next phone. There are some things I really like about windows phone like the lockscreen, speed, and overall minimalistic look, but think there are things I would miss like the notification shade and the huge surplus of brand name apps. So what keeps you on Windows Phone?

EDIT: Just ordered my Lumia 521 off of HSN for $129.99. Thanks for all the helpful comments!