Better than Apple, Android... not so sure, Android is probably in a tie with windows, heh.
One reason Apple and Android are better.
There's pretty much no customization on the windows phone. Android has a lot of that, iPhones have that if jailbroken.
Windows isn't a competing phone on the market.
Apple may have a higher app store then Windows, but how many do people actually use? Most of the big apps are already ported to Windows.
Apple still has better performance, and what I wouldn't count (customization) since it's only can be done by jailbreaking.
You can't say performance... They depends on the manufacturer with the software. Apple may seem to have better performance because it's their hardware AND software. Nokia runs fine on Windows with no issues. Not to mention apps tend to lag at times on Apple.