Android or windows mobile?

The choice of Smartphone & its operating system is really down to your personal needs & taste.

The link below is one the most impartial & reasonably current. Windows has recently improved its App store in both quantity & quality. ( it was pretty awful !).
Shame really as the Nokia phones look, perform well & represent very good value. My worry is with MS' s commitment, they have just dumped unsuccessful products in the past. Their market share is still poor & not many other manufacturer s have released Windows Phones.

www.digitaltrends.com/mobile/best-smartphone-os/

I have chosen Android, well pleased with my Samsung Note2, its versatility, connectability & customable nature.

It is up to you & how you use your phone as I previously said
Hope this helps.