[Sprint LG G3] br0adband:
As a previous owner of several G2's (Sprint variants) I'm happy that I now have a G3 finally (and yes it's the Sprint model). Having said that, I'm currently "stuck" at the moment because of a damaged digitizer but I'll be ordering a new display assembly here in short order hopefully.

Comparing the G3 vs the N5 directly it's pretty blatantly obvious that the G3 is vastly superior in most every respect that matters - I'm wondering if you meant to say the N6 instead because that would be more aligned in a comparison in terms of hardware:

- same resolution screens albeit LCD vs AMOLED, 5.5" vs 5.96" - the G3 "looks" sharper because of the much higher PPI at 538 vs 493 for the N6 - I have two friends that own an N6 at this time and the one thing I hear from them most often is they love the color saturation of the AMOLED panel but they wish it was LCD because in direct sunlight the AMOLED just washes out pretty severely, and I am the same way: I love AMOLED color representation but outside in daylight, forget it, the G3 wins without question (my opinion based on my own usage and experience, however)

- the N6 is technically more powerful with the Snapdragon 805 at 2.7 GHz vs the G3 with the 801 at 2.5 GHz but the difference is negligible in actual day to day performance

- 3GB of RAM in each device (given you have the 32GB model from Sprint) so that's a draw

- form factor isn't that different save for getting used to the G3 having the rear mounted controls, it takes a little getting used to but in the long run I've come to find it works fine for me after that "honeymoon" period

- pure stock Android on the N6 vs the very nicely themed G3 experience, this one is simply a personal preference and nothing more: I prefer the G3's UI actually; when I had my G2(s) over the past year I ran CloudyG3 on them (now properly renamed to CloudyG2, however) and loved it. I can see why people prefer the stock Android even in spite of them using some third party launcher like Nova or something else even so

- microSD slot for increased storage + the removable battery pushes the G3 into the lead for me, however - I'm not saying it's better automagically just because the hardware supports it, I'm saying that for me it's better because I prefer such aspects in my smartphones, those two things were lacking in the G2 and I'm happy that LG came around and added them because it makes the G3 nearly perfect to me (I wish it just had a 1920x1080 display, however)

- battery life is an important aspect as well and I'm confident that the G3 with Lollipop (since it's now available, even for the Sprint variant) should get improved battery life (there's that memory glitch with 5.0.1 but I'm sure it'll be addressed soon enough). Can't speak for the N5 or the N6 with respect to battery life but I'm pretty sure the G3 may give better results. GSMArena gave the N6 a 70 hour endurance rating and the G3 a 63 in the same test, so they're very similar overall depending on usage

Also realize that because of how the G3 is designed with the back-mounted buttons, the 5.5" display on it and the entire casing of the G3 takes up less space than the N6 does - the N6 is a very large device overall, a monster sized phone these days so that may play into your decision as well. There's a size comparison at: https://www.youtube.com/watch?v=xBrbCB50wJ0 - pretty dramatic difference. :)

But these kinds of comparisons are a dime a dozen these days, you've probably done the research already anyway, iamterence, so none of this is really new. What you have to decide is only something you can decide, as the case may be:

Which device suits your needs and requirements best...

What I suggest to people is sit down for a few minutes and do a pros/cons list of the things you need and require a smartphone in today's world to do for you given your usage expectations, then find a device that most closely matches the pros while having the least cons. It takes a while to do it obviously but when you're done you should have a lock on which device will be your choice.

If it's the G3 vs the N5, I'll take the G3 anytime. If it's the G3 vs the N6, I'd still take the G3 because I just prefer what it offers - pure stock Android on a Nexus is a nice thing, but it's lacking to me in many respects.

Also, I do agree with what was said above about the CDMA vs GSM thing overall but the G2 and the G3 really don't have much issues with getting GSM functionality. I personally can't stand LTE for various reasons but that's another thread altogether, so for me using HSPA+ on these devices is better in my situation and gives me 35Mbps or better where I live in Las Vegas which is pretty much saturated by T-Mobile service (my carrier of choice). If your intention - as a Sprint customer - is to use the device with that carrier then that whole CDMA vs GSM thing is a moot point anyway. If, however, you hope to use the device with another provider based on AT&T or T-Mobile's networks aka GSM then understand that unlocking the domestic GSM usage for the G3 isn't that tough at all, really.

Again, do the list, find what you need and require then match it.

I'd say grab the G3 and run with it but, you're the one that has to make the final decision.

ps

KnockOn/KnockOff/KnockCode... once you start using it you will seriously wonder why every smartphone hasn't been doing this since day one. :)