Life will be different no doubt. If you are using google services, then its best to stick with Android. If you're using Whatsapp and facebook, then stick with it(the ones on WP are really bad/buggy). If you're using one-place notification center for all your events/activites, stick with Android. If you want to retain your keypad(old phone type) as keyboard, the only way is Android as it allows different keyboards to be installed. Remember all app support are going with IOS/ Android first. If you're willing to try something new and have some money to spare, then try WP8. Otherwise its best to continue using Android
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I wont argue here but if he gets a budget/cheap android,
1. how durable will it be ?
2. will it get future updates ?
3.its a budget phone, it wont have a snappy, fluid performance overall, resulting in lag,// will drive him crazy after some time
4.viruses,spam,etc are best found in google services/store
5.battery life umm it will be pathetic
6.whatsapp is great on windows phone IMOP, now we have the functionality to multi upload pictures , videos and soon we will get the same for music files
7.the nokia brand itself is trustworthy
8.windowsphone is the fastest growing mobile os when compared to ios and android
9.nokia have great service towards customers
10.and wp8.1 will get a notification centre, voice assistant and hopefully a file manager for some people, and I guess ability to install apps on SD card .Microsoft could have implemented a notification centre in wp8 but they ran out of time and so it was delayed for future wp update according to Wikipedia.