(NB:
Some food for thought:
http://www.phonearena.com/reviews/Samsung-Galaxy-Note-II-vs-Apple-iPhone-5_id3152/page/3
Personally, syncing photos between the Note 2 and iPhoto is something that I haven't yet found a smooth way of doing. That isn't to say that you can't do it and the Note 2 camera app offers sharing via various services. It can also automatically upload photos to DropBox and (at least in some markets) you get 40GB of DropBox for 2 years with the phone. I find the gallery app on the Note 2 fairly feeble, too.
Might be a narrow win for the iPhone 5 on this one.
Well the Note 2 has a 5.5" 720p screen and the iPhone... doesn't.
Some people didn't like the OLED screen on the S3, but the Note 2 has a different pixel layout that addresses this.
iOS probably wins on ease-of-use with its more consistent interface. However, Android is now running a pretty close second and - as you say you already use Android - shouldn't bother you. The Samsung 'tweaks' to this seem generally well received - although they've introduced a bit of bloatware (e.g. with their own music/movie/app service).
Possibly more choice on iOS - you can check the iTunes store vs. Google Play yourself.
5.5" 720p 16:9 screen on the Note 2 wins again.
Well, you can get a 64GB iPhone, but it costs.
Don't think the Note 2 comes in 64GB and the 32GB one has been hard to get hold of in the past, so you may end up with 16GB. However, the Note 2 has an SD card slot so you can add 8, 16, 32 or 64GB of extra storage for media very cheaply. The only fly in the ointment is if your 'loads of stuffs' includes a lot of Apps, since these can't easily be moved to the SD card. However, generally its music and videos that eat space and they work from SD just fine.
Don't know about this. However, there's an android App called AirDroid which lets you access messages from your Mac and even send messages via your phone using the Mac's display and keyboard (Not exactly a response to your question but seriously cool).
iPhone 5 unsurprisingly wins there.
As you already have an Android, you'll know the basics - except that newer versions of Android don't include the 'USB disc mode' option that let you mount your phone like a disc drive on the Mac. Yiu have to use the Android File Transfer app, which gives you a drag-and-drop interface but not quite the flexibility of a mounted drive.
Samsung supply a rather uninspiring iTunes-a-like sync/transfer application called "Kies" which, unfortunately, also breaks Android File Transfer - you have to uninstall Kies completely to get AFT to work.
This is much less of an issue if you're using cloud services like Google Drive, Google Music, Dropbox etc. and Email, contacts, calendars work fine if you move them to Gmail - the Mac apps work fine with Gmail accounts.
In that case, wait 4 months before making the decision, as there will be new shiny things out by then.
At the moment, though, if you want to kick sand in iPhone users faces, just fire up the split-screen multitasking mode on the Note 2, or show them the s-pen in action. No contest.