I would have to agree the S2 imho is the better of the two.
A lot of support for custom roms...
A VERY stable phone as it is...
And performance wise, it's really quick even on stock ROMs..
My wife has an S2 (non-LTE), running stock 4.1.2.. it's FAST.. and that's saying something for stock ROMs..
Stock 4.1.2 on my Galaxy Note is garbage.. one of the reasons I HAD to root it, etc..
Plus my buddy has a Nexus.. and I've noticed when doing stuff with ROMs etc.. having an SD card slot, removable battery, etc is nice when modding if errors come up..
Samsung Galaxy Note SGH-i717d (Telus) Unlocked
Android 4.1.2 - CM-10.0.0 - quincyatt (Rooted)
CWM 126.96.36.199 Custom Recovery