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Thats a good point. Besides I think an iPhone would compliment windows phone much more than android.I would keep the iPhone 4S.
The Lumia 1520 is really really BIG. I'm sure that sometimes it's nice to use a small smartphone (sometimes when partying etc.). With the Note 2 you would have 2 really really BIG phones (aka phablets). Would be too much for me.
Both, you should sell both.
I've still got apps in Android or IOS that are not in Windows Phone 8 yet, e.g. Tango for video calls. My google contacts is the master copy, although I occasionally sync to IOS as well for backups.
From experience, Samsung devices don't hold their price well.
Apple device hold their price well until a certain point. That said, the 4S has a ridiculous price right now online - ridiculous for a two year old phone.
That is because many people still prefer the 4S over the 5/5C/5S because it feels so wellmade, it's smaller and you just have a wow feeling when holding it (like with the Lumia 1520). The iPhone 5 series just feels cheap. Many people dislike that.