Depends on what you are going to use your phone for. My N3 is my brain at work. Too much going on to keep up with and s-pen is a lifesaver for all the little details. But it is big. If it is work related than go for N3. If you are just using phone for calls, texts and consumption than go for the S5. The added screen size on N3 is nice and all but I would have stuck with s4 if I didn't need it for work. Both devices have longevity as far as processor and specs so no issue there. Hold out for 32gb S5 though. 16gb with 8 usable is worthless. I'm not a gamer and my 32gb N3 only has about 8gb left with all my media on sd card. You can't go wrong with either device but if you don't use the s-pen I don't see much point in having a huge phone. Now, that being said, search YouTube for note 3 features and watch some videos on s-pen. There are many uses for it, some of which you might like and use. But, I would honestly rarely use it on a personal level but use it all the time for work related tasks. Just have to decide what your needs are. If you like bigger screen for gaming just buy a tablet because the N3 can be a hassle to carry around sometimes. You can't go wrong with either device.
ATT N3