I have both, an Android and a Windows phone:
I like the Sony Experia best. It has a very bright 3,3" Display with 297 dpi.
I like the Sonys too.
I have the Xperia Z. I just updated to kitcat and there's a one click root so I'm rooted and ready.
I've also got a windows 8 phone and it's just an amazing tool to connect 1:1 with my installation.
Sony Experia Z is an awesome handset. I love their hardware.
I'm a huge Android fan (since 09) but I have to admit that WP is pretty awesome. I just got the Lumia Icon on Thursday and I love it.
Apps are a hundred times better looking on WP than Android and the overall user experience has been exceptional.
I can't wait until WP 8.1 drops with Cortana. Thats going to be killer.
I'm going to be sticking with Windows Phone for a while. I like where it's going.
I use a Mac while at work and when I'm home I'll work using my Dell XPS 12 running Windows 8.
Ubuntu is pure awesomeness. I really want to see the OS (Ubuntu) take off on smartphones but with Android and iOS dominating that space it's going to be hard. Consumers are a lot like sheep. They follow the current trends. I like to go off the beaten path and try new things rather than have tech blogs tell me whats good. 9 x out of 10 they are wrong anyhow.