Note2 > S3 > note at this point in time. S4 is right around the corner which means the note3 isn't too far off either. Right now isn't really a good time to upgrade
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If we're to believe Samsung Display, the display arm of Samsung, which is actually a desperate company, there might not be a Note 3 as we know it. They're replacing both the Note 2 display, as well as the S3 display with a 1920x1080 4.99 inch panel this year. This according to Anandtech. I suppose we could see a curved OLED touting Note, but then again, flexible OLED yield isn't supposed to be good enough for production runs til 2014.
Unless they're keeping the display a secret, this is what most would expect. This doesn't mean that they'll have some other type of offering or combination to allow SPen functionality on say....the S4, but I wouldn't personally design a new chassis around an S4 and call it a Note.
I'd definitely choose the S3 at this point. The Development support will last significantly longer than it will for this device. Isn't it the most popular Android device ever? That is to say, more users often means more ROMs, the pressure to update and develop for it will be higher.
Since were not talking about an upgrade, its a no brainer.
But if you had to use an upgrade, or pay more than say....50-100 bucks (personal figure) I definitely wouldn't do it. A new generation of SoCs is just around the corner. Just as well, the GPU is much more powerful on the S3, but app support and UI/general performance isn't too much better now that we have 4.2 AOSP. And while an official JB is probably a couple months out, but it will bring most Note2 features home for us.
That's the current sitrep for both devices.
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