The following conclusion in my view:
+ I personally ('m left-handed) find the buttons on the back perfect!
+ Screen size - fun, etc. to seeing images, videos
+ Many useful software features (eg the adjustable keyboard, Selfie self-timer for those who need it ...)
+ "Knock Code" very practical and innovative
+ Under low light conditions acceptable image quality (for a smartphone)
+ Optical image stabilization leads to more stable video recordings (vs. S5)
- Battery life is too low (vs. S5)
- Screen is me "pale" and to dark (but am also an AMOLED fan!)
- Under good lighting conditions makes the S5 in my opinion much better photos and videos
- The laser autofocus seems really only in certain situations / intervals effective because in many cases tested snapshots usually the S5 had in the lead (and accordingly the images sharp!)
- Heat generation under stress very clearly
- Processing not optimal (cover creaked to a frequently used site below right)
I really struggled a long time with me, both models are just great! Ultimately, however, the S5 has won for me. It seems to me just mature and reliable. In addition, I can respect the so frequently invoked quality appearance is no real difference between LG and Samsung G3 S5 account, rather even the S5 seemed altogether something noble to me.