Re: windows app development
Good point, though Apple's doing some interesting things to make their phones and computers work together better--e.g. the "Continuity" feature between iOS 8 and OS X Yosemite. Apple will probably be hosting a WWDC preview about whatever comes after Yosemite by the time Windows 10 finally hits the market, so I find it a bit difficult to directly compare their respective ecosystem trajectories. Microsoft's Universal Apps sound good in theory, but Microsoft's still developing the concept. It'll be interesting to see how Microsoft toes the line between making money from iOS and Android apps, and making money by advancing its own ecosystem. Those goals aren't always in opposition for all users, but they conflict often enough that Microsoft will face some tough decision.
All that said, and the fuzziness of Universal Apps aside, I think Microsoft's doing a good job with Windows 10. I think they're evolving the the UI in an intelligent way, especially with their efforts to give desktop users more ways to organize and interact with their content (e.g. Windows 10's Task View, which is something like Mission Control in OS X).