The Web Wallet is the most popular, followed by the native Android App.
Where are you getting this from?
Anyway, I'd say, currently the best choice on Windows Phone would be
Copay Wallet which works quite well.
Should we continue to maintain the Windows Apps?
Yes, diversity is always more than welcome!
But please make sure to
not fuck it up like so many wallet developers seem to do. Make it user friendly, non-cluttered, easy to backup (and make it a HD wallet, so it needs to be backed up only once), and straightforward, intuitive to use. 9 out of 10 wallets (both desktop, mobile and web) go wrong with at least one of these points.