Here's the phones I've had (or tried) over the last year or 2 after jumping off the Blackberry ship...
Note 2, Droid Mini, HTC One (M7), Galaxy S5, LG G3
The Note 2 was too big - I loved it at first but when reality set in, I just wasn't happy with it. The Droid Mini was probably my favorite of the bunch (until the G3). The hardware felt great, I liked the smaller size but it was lacking on storage and the battery life was just good - not great. I didn't like the M7 at all (and never considered the M8 because it was bigger than the M7). I really liked the S5 alot; I was surprised that I did especially after not liking the Note 2 and really considered myself the anti-Samsung type. After I gave up on the Note I learned about Nova Launcher, so most of those devices I was able to try and have the same user experience. I hated TouchWiz, even the stripped down version on the S5 was too much for me. I fully expected to use it on the G3 but I don't think I will, the LG launcher is really nice. The size of the phone amazes me. Its almost exactly the same physical size as the S5 but gives you so much more screen real estate. All of the reviews I read about the G3 made it sound heavy too but it seems lighter than the S5 (at least to me). Speed-wise, I think I had less hiccups on the Samsung, but then again it could be because I used Nova. I wouldn't mind using Nova on the G3 but the fact that the Clock and Calendar widgets don't work its more of a pain than its worth and aside from a sliding dock, I can do everything I want on the LG launcher. Knock-on is amazing. I used to love that with the Droid Mini the motion of taking it out of my pocket would turn on the screen so I wouldn't have to keep hitting the power button.. KnockOn is even better, - I can just reach and tap the screen now if its on my desk to see if anything comes in.
Now, here's the few gripes I have with the G3 , some may be fixable and I haven't figured it out yet. None of these are deal breakers.
1) Can't remove the Google Photo App. I like the stock Gallery App, its annoying to get prompted on which one I want to use - I'd really like to just remove or disable the Google Photo App but its not listed in the Application Manager. (This is a work phone, I can't/shouldn't root it).
2) Within the Gallery App, you can't select multiple photos.. I used to be able to long press on a photo and it would get a check mark, then I could select others and do whatever with them (send via text/email, delete, move, etc) - on the G3 I have to do one at a time. (or go into the text message/email first and initiate the text/email) - but specially with deleting it would be nice to not have to do one at a time.
3) Can't disable SmartTips. I like the LG Health App and want to keep that accessible, it would be nice if I could make that the full length of the page or put something else where the Tips is.
4) The LED viewing angle isn't great. I think its recessed just enough into the body that its tough to see unless you're looking at it directly. Thats actually my biggest gripe with the phone. While KnockOn helps, I can just tap it - I do rely on the LED so I'm not constantly checking my phone. (I typically have volume/vibrate/alerts off during the day when its on my desk).
Anyway - that's a long post - sorta my personal review of the device and why I chose the G3.