In September 2017 I made a list of the advantages and dissadvantages between Windows Phone and Android. Here is it in no particular order or much research:
Disadvantages:
• Many apps are still build on Silverlight technology, which in my observations seem to cause the Loading... and Resuming... screens.
• Facebook Messenger crashes when attaching photos
• Twitter app crashes when attaching photos
• Can't delete apps directly from home screen
• Kik Messenger is unsupported
• Outlook Mail doesn't load YouTube mail optimally
• Outlook Mail pictures are huge for no reason (i.e no resize by mail app) / DPI scaling
• Auto correct only corrects one language at a time
• Only 2-3 maintained browsers
• Windows Hello is slow to recognise finger print
• UI inconsistencies, lots of design languages at the same time.
• Android send feedback immediately after a crash - no prompt on WP
• Swipe right for hamburger menu missing
• Close all apps button is missing
• Loading app from notifications is slow
• Random reboots?? Both on Luma 650 and Alcatel Idol 4s restart while using ms edge
• Many websites don't detect Edge's user agent, sites will direct you to a Google Play app which will result in the store opening and search for "intent" https://www.digitaltrends.com/computing/should-you-grab-an-amd-freesync-monitor-well-break-it-down-for-you/
• No screenshot preview
• App updates are slow (takes multiple days to updtae inbox apps on Lumia 650)
• Hyperlapse app crash
• No WhatsApp picture in notifications
• Can't change default apps like the browser to something different.
Advantages:
• Night mode is truly universal, unlike Android (my biggest gripe about Android..)
• Emoji's actually good, Google has ruined them in Android (faces look like blobs)
• Superior battery life
• Login to apps using biometrics
• Live tiles make for a clean looking home screen
• Apps can make use of Microsoft's new design language
• Use Cortana on the go, even outside of the US
• No sticky client unlike Android, improving corporate WiFi solutions with multiple APs on the same SSID
• Bing lockscreen images
• Delete any app via Powershell
• Access device statistics via web app
• No vendor or carrier specific updates (Coming to Android in Android Oreo)
• DPI scaling can be adjusted
• Continuum allows mobile device to be used as a desktop PC.
• ALL settings can be synced with a Microsoft account.
• Beta versions of the operating system can be installed by everyone.
• Paste button right on the keyboard