OK - here's an abbreviated re-write because I"m hoping to get feedback
Things that WP does better
1) lock screen notifications better on WP... at a glance I can see how many work emails, personal emails, facebook notifications or other customizable notifications. Can't see this on Android lock screen - only a couple tiles then you have to click and scroll around.
2) email account management - WP lets you have separate tiles for each email account. Each tile will show you how many new mails since you last checked. Google lumps them all together. You can filter by one account or another but the "new messages" number is a combined number or default account number and no way to see new messages. Worst than that, the number on the icon isn't new since last checked, it's all unread emails. So my number keeps going up and up and I never know if I've gotten new emails or not
3) browsing long lists - WP standard of organizing lists in to alpha, allowing you to browse easily clicking on alphabetical tiles is simple and easy. Prime example - music. I have 1000's of songs in my collection. When I browse by artist I click on the letter the artist starts with, get there quickly. Great UI when you use your phone for music while driving. Google play is one long list of artists that you have to scroll and scroll through. Alternative is search which requires you to type, or voice search, which I've found plays stuff from the google play online collection, often not what you want to hear.
4) toast notifications - WP are consistent, at the top of the screen, whether on lock screen or not. Click and you get to view the message or post etc. Haven't figured out Androids at all...
5) Battery life - more hw specfic but I"ve spent hours trying to find out how to optimize batter life. Have galaxy s6 128 GB. I'm using standard launcher for now. First attempt to optimize I might have got 6 hours before having to plugin. This morning after two minutes of browsing I lost 3% of life. I've done further optimization after combing through wads of settings. It's a bit better so far but not sure how much I've crippled the phone (or why I have to go through so much effort). This is supposed to be one of the best phones on the market.
6) Home customization, app navigation - WP is simple, does everything you need, very usable. Tiles display info, you can resize based on level of importance. Apps not on the start screen are in an easy to navigate list, using the alpha tiles just like music (and all WP lists). Android is basically an iOS copy. A bunch of icons you put on different cards you swipe to, none differentiated from other , other than icon design. Then there's a list of all apps which is again, just a list of icons on cards that you swipe, no way to easily navigate to apps that begin with S.. forced to use search. Customizing is cumbersome, often resulting in icons being bundled into groups when you didn't mean to. There's a giant search bar on the screen which does nothing but launch an app - why not just give an icon (or use the phone button like WP)
7) Browsing through open apps. WP let's you preview the full screen of open apps while you browse. Android stacks cards and you can't see information on them unless you select. There is a split screen feature which will help solve this, but haven't figured it out yet
8) Customizing the quick settings in the pull down... not sure how to do this in Android, but in WP I put those settings I toggled most in my quick swipe from top.
9) Swipe typing - waaaay more accurate in WP. Android is wrong most of the time and the suggestions aren't even close. Thumb typing on android might be a bit better.
10) Settings - confusing massive list buried in hierarchy of categories. Only way to find most stuff in settings is to first google online, then use Search in settings to find it. WP has a list of at most 20 settings groups which are easy to scroll through and find. (never understood though why WP settings weren't in alpha order with alpha tile navigation but it was short enough)
11) Facebook photo upload - can't believe this is the case but if you take a portrait photo, it uploads it sideways into facebook unless you catch it and rotate before upload. Such a common use case, can't believe you have to do this. If you accidentally upload it in this sideways fashion, you can't use the app to fix it. You have to go online.
that's what I remember I posted for now... will post more as I find. Note there's a great customization called Launcher 8 that makes it work just like a WP. Problem is it drains the battery so bad you can't use it reliably. If I get my other battery issues sorted